Vulnerability-Lookup

CVE-2026-29785 (GCVE-0-2026-29785)

Vulnerability from cvelistv5 – Published: 2026-03-25 19:38 – Updated: 2026-09-09 12:04

Title

NATS Server panic via malicious compression on leafnode port

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.14 and 2.12.5, if the nats-server has the "leafnode" configuration enabled (not default), then anyone who can connect can crash the nats-server by triggering a panic. This happens pre-authentication and requires that compression be enabled (which it is, by default, when leafnodes are used). Versions 2.11.14 and 2.12.5 contain a fix. As a workaround, disable compression on the leafnode port.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-28 01:33 UTC

CWE

CWE-476 - NULL Pointer Dereference
CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)

Assigner

GitHub_M mitre root

References

9 references

URL	Tags
https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
https://github.com/nats-io/nats-server/commit/a14…	x_refsource_MISC
https://advisories.nats.io/CVE/secnote-2026-04.txt	x_refsource_MISC
https://access.redhat.com/security/cve/CVE-2026-29785	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2451444	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:22347	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:23345	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21769	vendor-advisoryx_refsource_REDHAT

Impacted products

5 products

Vendor	Product	Version
nats-io	nats-server	Affected: < 2.11.14 Affected: >= 2.12.0-RC.1, < 2.12.5
Red Hat	Multicluster Global Hub 1.4.5	Unaffected: 1779579439 , < * (rpm) cpe:/a:redhat:multicluster_globalhub:1.4::el9
Red Hat	Multicluster Global Hub 1.6.5	Unaffected: 1780167118 , < * (rpm) cpe:/a:redhat:multicluster_globalhub:1.6::el9
Red Hat	Red Hat multicluster global hub 1.5.3	Unaffected: 1778867753 , < * (rpm) cpe:/a:redhat:multicluster_globalhub:1.5::el9
Red Hat	Red Hat OpenShift Container Platform 4	cpe:/a:redhat:openshift:4

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              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-52jh-2xxh-pwh6"
            },
            {
              "name": "https://github.com/nats-io/nats-server/commit/a1488de6f2ba6e666aef0f9cce0016f7f167d6a8",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/nats-io/nats-server/commit/a1488de6f2ba6e666aef0f9cce0016f7f167d6a8"
            },
            {
              "name": "https://advisories.nats.io/CVE/secnote-2026-04.txt",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://advisories.nats.io/CVE/secnote-2026-04.txt"
            }
          ],
          "source": {
            "advisory": "GHSA-52jh-2xxh-pwh6",
            "discovery": "UNKNOWN"
          },
          "title": "NATS Server panic via malicious compression on leafnode port"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-29785",
        "datePublished": "2026-03-25T19:38:44.587Z",
        "dateReserved": "2026-03-04T16:26:02.899Z",
        "dateUpdated": "2026-09-09T12:04:53.932Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

bit-nats-2026-29785

Vulnerability from bitnami_vulndb

Published

2026-03-27 17:45

Modified

2026-09-08 08:34

Summary

NATS Server panic via malicious compression on leafnode port

Details

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "nats",
        "purl": "pkg:bitnami/nats"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.11.14"
            },
            {
              "introduced": "2.12.0"
            },
            {
              "fixed": "2.12.5"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-29785"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:nats:nats_server:*:*:*:*:*:go:*:*"
    ],
    "severity": "High"
  },
  "details": "NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.14 and 2.12.5, if the nats-server has the \"leafnode\" configuration enabled (not default), then anyone who can connect can crash the nats-server by triggering a panic. This happens pre-authentication and requires that compression be enabled (which it is, by default, when leafnodes are used). Versions 2.11.14 and 2.12.5 contain a fix. As a workaround, disable compression on the leafnode port.",
  "id": "BIT-nats-2026-29785",
  "modified": "2026-09-08T08:34:36.952Z",
  "published": "2026-03-27T17:45:10.061Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://advisories.nats.io/CVE/secnote-2026-04.txt"
    },
    {
      "type": "FIX",
      "url": "https://github.com/nats-io/nats-server/commit/a1488de6f2ba6e666aef0f9cce0016f7f167d6a8"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-52jh-2xxh-pwh6"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-29785"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:21769"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:22347"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:23345"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-29785"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451444"
    },
    {
      "type": "WEB",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29785.json"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "NATS Server panic via malicious compression on leafnode port"
}

CERTFR-2026-AVI-0406

Vulnerability from certfr_avis - Published: 2026-04-08 - Updated: 2026-04-08

De multiples vulnérabilités ont été découvertes dans les produits Microsoft. Elles permettent à un attaquant de provoquer un problème de sécurité non spécifié par l'éditeur.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

None

Impacted products

Vendor	Product	Description
Microsoft	N/A	azl3 python-ecdsa 0.18.0-2 versions antérieures à 0.19.2-1
Microsoft	N/A	azl3 freeipmi 1.6.11-1 versions antérieures à 1.6.17-1
Microsoft	N/A	azl3 kernel 6.6.130.1-3 versions antérieures à 6.6.130.1-3
Microsoft	N/A	azl3 nodejs 20.14.0-14 versions antérieures à 20.14.0-15
Microsoft	N/A	azl3 gdk-pixbuf2 2.42.10-4 versions antérieures à 2.42.10-5
Microsoft	N/A	azl3 vim 9.2.0240-1 versions antérieures à 9.2.0315-1
Microsoft	N/A	azl3 telegraf 1.31.0-17 versions antérieures à 1.31.0-18

References

Title

Publication Time

FKIE_CVE-2026-29785

Vulnerability from fkie_nvd - Published: 2026-03-25 20:16 - Updated: 2026-09-09 13:19

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

References

URL	Tags
security-advisories@github.com	https://advisories.nats.io/CVE/secnote-2026-04.txt	Mitigation, Vendor Advisory
security-advisories@github.com	https://github.com/nats-io/nats-server/commit/a1488de6f2ba6e666aef0f9cce0016f7f167d6a8	Patch
security-advisories@github.com	https://github.com/nats-io/nats-server/security/advisories/GHSA-52jh-2xxh-pwh6	Mitigation, Vendor Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:21769
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:22347
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:23345
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/security/cve/CVE-2026-29785
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://bugzilla.redhat.com/show_bug.cgi?id=2451444
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29785.json

Impacted products

	Vendor	Product	Version
	linuxfoundation	nats-server	*
	linuxfoundation	nats-server	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "nats-server",
          "vendor": "nats-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.11.14"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.12.0-RC.1, \u003c 2.12.5"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    },
    {
      "affectedData": [
        {
          "collectionURL": "https://catalog.redhat.com/software/containers/",
          "cpes": [
            "cpe:/a:redhat:multicluster_globalhub:1.4::el9"
          ],
          "defaultStatus": "affected",
          "packageName": "multicluster-globalhub/multicluster-globalhub-grafana-rhel9",
          "product": "Multicluster Global Hub 1.4.5",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "1779579439",
              "versionType": "rpm"
            }
          ]
        },
        {
          "collectionURL": "https://catalog.redhat.com/software/containers/",
          "cpes": [
            "cpe:/a:redhat:multicluster_globalhub:1.6::el9"
          ],
          "defaultStatus": "affected",
          "packageName": "multicluster-globalhub/multicluster-globalhub-grafana-rhel9",
          "product": "Multicluster Global Hub 1.6.5",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "1780167118",
              "versionType": "rpm"
            }
          ]
        },
        {
          "collectionURL": "https://catalog.redhat.com/software/containers/",
          "cpes": [
            "cpe:/a:redhat:multicluster_globalhub:1.5::el9"
          ],
          "defaultStatus": "affected",
          "packageName": "multicluster-globalhub/multicluster-globalhub-grafana-rhel9",
          "product": "Red Hat multicluster global hub 1.5.3",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "1778867753",
              "versionType": "rpm"
            }
          ]
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:openshift:4"
          ],
          "defaultStatus": "unaffected",
          "packageName": "openshift4/oc-mirror-plugin-rhel9",
          "product": "Red Hat OpenShift Container Platform 4",
          "vendor": "Red Hat"
        }
      ],
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "4AC9CDDF-79F4-406A-8BD9-B19953A76A4F",
              "versionEndExcluding": "2.11.14",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B141DA72-3502-4746-A246-EE1087C993F4",
              "versionEndExcluding": "2.12.5",
              "versionStartIncluding": "2.12.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.14 and 2.12.5, if the nats-server has the \"leafnode\" configuration enabled (not default), then anyone who can connect can crash the nats-server by triggering a panic. This happens pre-authentication and requires that compression be enabled (which it is, by default, when leafnodes are used). Versions 2.11.14 and 2.12.5 contain a fix. As a workaround, disable compression on the leafnode port."
    },
    {
      "lang": "es",
      "value": "NATS-Server es un servidor de alto rendimiento para NATS.io, un sistema de mensajer\u00eda nativo de la nube y del borde. Antes de las versiones 2.11.14 y 2.12.5, si el nats-server tiene la configuraci\u00f3n \u0027leafnode\u0027 habilitada (no predeterminada), entonces cualquiera que pueda conectarse puede bloquear el nats-server al desencadenar un p\u00e1nico. Esto ocurre antes de la autenticaci\u00f3n y requiere que la compresi\u00f3n est\u00e9 habilitada (lo cual est\u00e1 habilitado, por defecto, cuando se usan leafnodes). Las versiones 2.11.14 y 2.12.5 contienen una correcci\u00f3n. Como soluci\u00f3n alternativa, deshabilite la compresi\u00f3n en el puerto leafnode."
    }
  ],
  "id": "CVE-2026-29785",
  "lastModified": "2026-09-09T13:19:11.863",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-29785",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-03-28T01:33:48.548539Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-03-25T20:16:30.373",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Mitigation",
        "Vendor Advisory"
      ],
      "url": "https://advisories.nats.io/CVE/secnote-2026-04.txt"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/nats-io/nats-server/commit/a1488de6f2ba6e666aef0f9cce0016f7f167d6a8"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Mitigation",
        "Vendor Advisory"
      ],
      "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-52jh-2xxh-pwh6"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://access.redhat.com/errata/RHSA-2026:21769"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://access.redhat.com/errata/RHSA-2026:22347"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://access.redhat.com/errata/RHSA-2026:23345"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://access.redhat.com/security/cve/CVE-2026-29785"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451444"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29785.json"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-409"
        }
      ],
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "type": "Secondary"
    }
  ]
}

GHSA-52JH-2XXH-PWH6

Vulnerability from github – Published: 2026-03-24 21:29 – Updated: 2026-03-27 22:09

Summary

NATS Server panic via malicious compression on leafnode port

Details

Background

NATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing.

When configured to accept leafnode connections (for a hub/spoke topology of multiple nats-servers), then the default configuration allows for negotiating compression; a malicious remote NATS server can trigger a server panic via that compression.

Problem Description

If the nats-server has the "leafnode" configuration enabled (not default), then anyone who can connect can crash the nats-server by triggering a panic. This happens pre-authentication and requires that compression be enabled (which it is, by default, when leafnodes are used).

Context: a NATS server can form various clustering topologies, including local clusters, and superclusters of clusters, but leafnodes allow for separate administrative domains to link together with limited data communication; eg, a server in a moving vehicle might use a local leafnode for agents to connect to, and sync up to a central service as and when available. The leafnode configuration here is where the central server allows other NATS servers to connect into it, almost like regular NATS clients. Documentation examples typically use port 7422 for leafnode communications.

Affected Versions

Version 2, prior to v2.11.14 or v2.12.5

Workarounds

Disable compression on the leafnode port:

leafnodes {
  port: 7422
  compression: off
}

Severity

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/nats-io/nats-server/v2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.11.14"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/nats-io/nats-server/v2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.12.0-RC.1"
            },
            {
              "fixed": "2.12.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/nats-io/nats-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-29785"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-24T21:29:06Z",
    "nvd_published_at": "2026-03-25T20:16:30Z",
    "severity": "HIGH"
  },
  "details": "### Background\n\nNATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing.\n\nWhen configured to accept leafnode connections (for a hub/spoke topology of multiple nats-servers), then the default configuration allows for negotiating compression; a malicious remote NATS server can trigger a server panic via that compression.\n\n### Problem Description\n\nIf the nats-server has the \"leafnode\" configuration enabled (not default), then anyone who can connect can crash the nats-server by triggering a panic. This happens pre-authentication and requires that compression be enabled (which it is, by default, when leafnodes are used).\n\nContext: a NATS server can form various clustering topologies, including local clusters, and superclusters of clusters, but leafnodes allow for separate administrative domains to link together with limited data communication; eg, a server in a moving vehicle might use a local leafnode for agents to connect to, and sync up to a central service as and when available. The leafnode configuration here is where the central server allows other NATS servers to connect into it, almost like regular NATS clients. Documentation examples typically use port 7422 for leafnode communications.\n\n### Affected Versions\n\nVersion 2, prior to v2.11.14 or v2.12.5\n\n### Workarounds\n\nDisable compression on the leafnode port:\n\n```\nleafnodes {\n  port: 7422\n  compression: off\n}\n```",
  "id": "GHSA-52jh-2xxh-pwh6",
  "modified": "2026-03-27T22:09:21Z",
  "published": "2026-03-24T21:29:06Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-52jh-2xxh-pwh6"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-29785"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nats-io/nats-server/commit/a1488de6f2ba6e666aef0f9cce0016f7f167d6a8"
    },
    {
      "type": "WEB",
      "url": "https://advisories.nats.io/CVE/secnote-2026-04.txt"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/nats-io/nats-server"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "NATS Server panic via malicious compression on leafnode port"
}

MSRC_CVE-2026-29785

Vulnerability from csaf_microsoft - Published: 2026-04-02 01:06 - Updated: 2026-09-25 02:24

Summary

NATS Server panic via malicious compression on leafnode port

Scope

1 vulnerability in this advisory, including CVE-2026-29785.

CVE-2026-29785

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Fixed: 1 product Known affected: 3 products

https://learn.microsoft.com/en-us/azure/azure-linux/tutoria…

Open the full advisory

RHSA-2026:21769

Vulnerability from csaf_redhat - Published: 2026-05-28 20:39 - Updated: 2026-10-03 22:09

Summary

Red Hat Security Advisory: Multicluster Global Hub 1.5.4 security update

Severity

Important

Scope

35 vulnerabilities in this advisory, including CVE-2026-29785.

CVE-2026-29785

A flaw was found in NATS-Server. A remote attacker can exploit this vulnerability by connecting to a NATS-Server instance where the 'leafnode' configuration is enabled and compression is active. This pre-authentication flaw allows the attacker to trigger a server crash, resulting in a Denial of Service (DoS) for the affected system.

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Fixed: 4 products Known not affected: 17 products

https://access.redhat.com/errata/RHSA-2026:21769

Open the full advisory

RHSA-2026:22347

Vulnerability from csaf_redhat - Published: 2026-06-01 22:12 - Updated: 2026-10-03 22:09

Summary

Red Hat Security Advisory: Multicluster Global Hub 1.4.5 security update

Severity

Important

Scope

35 vulnerabilities in this advisory, including CVE-2026-29785.

CVE-2026-29785

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Fixed: 4 products Known not affected: 17 products

https://access.redhat.com/errata/RHSA-2026:22347

Open the full advisory

RHSA-2026:23345

Vulnerability from csaf_redhat - Published: 2026-06-04 14:16 - Updated: 2026-10-03 22:09

Summary

Red Hat Security Advisory: Multicluster Global Hub 1.6.2 security update

Severity

Important

Scope

35 vulnerabilities in this advisory, including CVE-2026-29785.

CVE-2026-29785

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Fixed: 4 products Known not affected: 17 products

https://access.redhat.com/errata/RHSA-2026:23345

Open the full advisory

UBUNTU-CVE-2026-29785 (CVE-2026-29785)

Vulnerability from osv_ubuntu – Published: 2026-03-25 20:16 – Updated: 2026-07-02 16:12 – Source website

Details

Severity

7.5 (High)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

7.5 (High)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-29785	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-29785	REPORT
	https://advisories.nats.io/CVE/secnote-2026-04.txt	REPORT
	https://github.com/nats-io/nats-server/commit/a14…	REPORT
	https://github.com/nats-io/nats-server/security/a…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-nats-io-nats-server-dev",
            "binary_version": "2.10.7-1ubuntu0.3"
          },
          {
            "binary_name": "nats-server",
            "binary_version": "2.10.7-1ubuntu0.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "nats-server",
        "purl": "pkg:deb/ubuntu/nats-server@2.10.7-1ubuntu0.3?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.9.19-1build1",
        "2.10.3-1",
        "2.10.4-1",
        "2.10.7-1",
        "2.10.7-1ubuntu0.1",
        "2.10.7-1ubuntu0.2",
        "2.10.7-1ubuntu0.3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-nats-io-nats-server-dev",
            "binary_version": "2.10.27-1"
          },
          {
            "binary_name": "nats-server",
            "binary_version": "2.10.27-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "nats-server",
        "purl": "pkg:deb/ubuntu/nats-server@2.10.27-1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.10.24-1",
        "2.10.27-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-nats-io-nats-server-dev",
            "binary_version": "2.10.27-1ubuntu0.26.04.1~esm1"
          },
          {
            "binary_name": "nats-server",
            "binary_version": "2.10.27-1ubuntu0.26.04.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:26.04:LTS",
        "name": "nats-server",
        "purl": "pkg:deb/ubuntu/nats-server@2.10.27-1ubuntu0.26.04.1~esm1?arch=source\u0026distro=esm-apps/resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.10.27-1",
        "2.10.27-1build1",
        "2.10.27-1ubuntu0.26.04.1~esm1"
      ]
    }
  ],
  "aliases": [],
  "details": "NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.14 and 2.12.5, if the nats-server has the \"leafnode\" configuration enabled (not default), then anyone who can connect can crash the nats-server by triggering a panic. This happens pre-authentication and requires that compression be enabled (which it is, by default, when leafnodes are used). Versions 2.11.14 and 2.12.5 contain a fix. As a workaround, disable compression on the leafnode port.",
  "id": "UBUNTU-CVE-2026-29785",
  "modified": "2026-07-02T16:12:00Z",
  "published": "2026-03-25T20:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-29785"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-29785"
    },
    {
      "type": "REPORT",
      "url": "https://advisories.nats.io/CVE/secnote-2026-04.txt"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/nats-io/nats-server/commit/a1488de6f2ba6e666aef0f9cce0016f7f167d6a8"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-52jh-2xxh-pwh6"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-29785"
  ]
}

WID-SEC-W-2026-0641

Vulnerability from csaf_certbund - Published: 2026-03-09 23:00 - Updated: 2026-06-01 22:00

Summary

NATS Server: Mehrere Schwachstellen ermöglichen Denial of Service

Severity

Mittel

Scope

2 vulnerabilities in this advisory, including CVE-2026-29785.

CVE-2026-29785

Known affected: 3 products

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-29785 (GCVE-0-2026-29785)

Vulnerability from bitnami_vulndb

Solutions

Background

Problem Description

Affected Versions

Workarounds

UBUNTU-CVE-2026-29785 (CVE-2026-29785)

Tags

Sightings

Nomenclature

Related by attack behaviour