CVE-2026-46600 (GCVE-0-2026-46600)

Vulnerability from cvelistv5 – Published: 2026-07-21 19:18 – Updated: 2026-08-14 15:46
VLAI
Title
Parsing an invalid SVCB or HTTPS RR can panic in golang.org/x/net/dns/dnsmessage
Summary
Parsing an invalid SVCB or HTTPS RR can panic when the size of a parameter value overflows the message buffer.
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 2026-07-23 15:00 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version
Go standard library net Affected: 1.26.0-0 , < 1.26.6 (semver)
Affected: 1.27.0-0 , < 1.27.0-rc.3 (semver)
Create a notification for this product.
golang.org/x/net golang.org/x/net/dns/dnsmessage Affected: 0 , < 0.56.0 (semver)
Create a notification for this product.
Credits
Mundur (https://github.com/M0nd0R)
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-46600",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-23T15:00:27.171241Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-125",
                "description": "CWE-125 Out-of-bounds Read",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-23T15:00:35.473Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "net",
          "product": "net",
          "programRoutines": [
            {
              "name": "cgoResSearch"
            },
            {
              "name": "LookupCNAME"
            },
            {
              "name": "Resolver.LookupCNAME"
            }
          ],
          "vendor": "Go standard library",
          "versions": [
            {
              "lessThan": "1.26.6",
              "status": "affected",
              "version": "1.26.0-0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.27.0-rc.3",
              "status": "affected",
              "version": "1.27.0-0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "golang.org/x/net/dns/dnsmessage",
          "product": "golang.org/x/net/dns/dnsmessage",
          "programRoutines": [
            {
              "name": "unpackSVCBResource"
            },
            {
              "name": "Message.Unpack"
            },
            {
              "name": "Parser.Additional"
            },
            {
              "name": "Parser.AllAdditionals"
            },
            {
              "name": "Parser.AllAnswers"
            },
            {
              "name": "Parser.AllAuthorities"
            },
            {
              "name": "Parser.Answer"
            },
            {
              "name": "Parser.Authority"
            },
            {
              "name": "Parser.HTTPSResource"
            },
            {
              "name": "Parser.SVCBResource"
            }
          ],
          "vendor": "golang.org/x/net",
          "versions": [
            {
              "lessThan": "0.56.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Mundur (https://github.com/M0nd0R)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Parsing an invalid SVCB or HTTPS RR can panic when the size of a parameter value overflows the message buffer."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-125: Out-of-bounds Read",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-14T15:46:12.894Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://go.dev/cl/786345"
        },
        {
          "url": "https://go.dev/issue/79795"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/94pEornpRlI"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-5942"
        }
      ],
      "title": "Parsing an invalid SVCB or HTTPS RR can panic in golang.org/x/net/dns/dnsmessage"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2026-46600",
    "datePublished": "2026-07-21T19:18:59.755Z",
    "dateReserved": "2026-05-15T17:35:00.814Z",
    "dateUpdated": "2026-08-14T15:46:12.894Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-46600",
      "date": "2026-10-03",
      "epss": "0.0063",
      "percentile": "0.4837"
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-10-02T14:38:20+00:00",
      "cve": "CVE-2026-46600",
      "id": "CVE-2026-46600",
      "initial_release_date": "2026-07-21T19:18:59.755000+00:00",
      "product_status:fixed": "172",
      "product_status:known_affected": "50",
      "product_status:known_not_affected": "1859",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "golang.org/x/net/dns/dnsmessage: golang.org/x/net/dns/dnsmessage: Denial of Service via invalid DNS record parsing",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46600.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-02T16:52:12Z",
      "cve": "CVE-2026-46600",
      "id": "CVE-2026-46600",
      "initial_release_date": "2026-07-24T02:21:48Z",
      "product_status:known_affected": "270",
      "product_status:known_not_affected": "389",
      "product_status:recommended": "53",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-46600",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46600.json",
      "version": "14"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "cvssV3_1": {
                  "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"
                }
              },
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-46600",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-07-23T15:00:27.171241Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-125",
                    "description": "CWE-125 Out-of-bounds Read",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-07-23T15:00:16.150Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "collectionURL": "https://pkg.go.dev",
              "defaultStatus": "unaffected",
              "packageName": "net",
              "product": "net",
              "programRoutines": [
                {
                  "name": "cgoResSearch"
                },
                {
                  "name": "LookupCNAME"
                },
                {
                  "name": "Resolver.LookupCNAME"
                }
              ],
              "vendor": "Go standard library",
              "versions": [
                {
                  "lessThan": "1.26.6",
                  "status": "affected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThan": "1.27.0-rc.3",
                  "status": "affected",
                  "version": "1.27.0-0",
                  "versionType": "semver"
                }
              ]
            },
            {
              "collectionURL": "https://pkg.go.dev",
              "defaultStatus": "unaffected",
              "packageName": "golang.org/x/net/dns/dnsmessage",
              "product": "golang.org/x/net/dns/dnsmessage",
              "programRoutines": [
                {
                  "name": "unpackSVCBResource"
                },
                {
                  "name": "Message.Unpack"
                },
                {
                  "name": "Parser.Additional"
                },
                {
                  "name": "Parser.AllAdditionals"
                },
                {
                  "name": "Parser.AllAnswers"
                },
                {
                  "name": "Parser.AllAuthorities"
                },
                {
                  "name": "Parser.Answer"
                },
                {
                  "name": "Parser.Authority"
                },
                {
                  "name": "Parser.HTTPSResource"
                },
                {
                  "name": "Parser.SVCBResource"
                }
              ],
              "vendor": "golang.org/x/net",
              "versions": [
                {
                  "lessThan": "0.56.0",
                  "status": "affected",
                  "version": "0",
                  "versionType": "semver"
                }
              ]
            }
          ],
          "credits": [
            {
              "lang": "en",
              "value": "Mundur (https://github.com/M0nd0R)"
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "Parsing an invalid SVCB or HTTPS RR can panic when the size of a parameter value overflows the message buffer."
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "description": "CWE-125: Out-of-bounds Read",
                  "lang": "en"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-13T21:58:52.611Z",
            "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
            "shortName": "Go"
          },
          "references": [
            {
              "url": "https://go.dev/cl/786345"
            },
            {
              "url": "https://go.dev/issue/79795"
            },
            {
              "url": "https://groups.google.com/g/golang-announce/c/94pEornpRlI"
            },
            {
              "url": "https://pkg.go.dev/vuln/GO-2026-5942"
            }
          ],
          "title": "Parsing an invalid SVCB or HTTPS RR can panic in golang.org/x/net/dns/dnsmessage"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "assignerShortName": "Go",
        "cveId": "CVE-2026-46600",
        "datePublished": "2026-07-21T19:18:59.755Z",
        "dateReserved": "2026-05-15T17:35:00.814Z",
        "dateUpdated": "2026-08-13T21:58:52.611Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


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.