Vulnerability-Lookup

CVE-2026-8606 (GCVE-0-2026-8606)

Vulnerability from cvelistv5 – Published: 2026-05-26 23:59 – Updated: 2026-05-27 13:50

Title

Server-Side Request Forgery in GitHub Enterprise Server via Advisory Package URL Endpoint

Summary

A Server-Side Request Forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed an attacker to cause the server to issue HTTP requests to internal services via the security advisories package lookup feature. By directing requests to an internal management service and measuring response timing, an attacker could infer the values of sensitive environment variables, including signing secrets and private keys. Exploitation required GitHub Packages to be enabled; on instances not running in private mode the vulnerability was exploitable without authentication, otherwise any authenticated user could exploit it. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21.1 and was fixed in versions 3.20.3, 3.19.7, 3.18.10, 3.17.16, and 3.16.19. This vulnerability was reported via the GitHub Bug Bounty program.

Severity

7 (High)


                        
                          CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-27 13:50 UTC

CWE

CWE-918 - Server-Side request forgery (SSRF)

Assigner

GitHub_P mitre root

References

6 references

URL	Tags
https://docs.github.com/en/enterprise-server@3.21…	release-notes
https://docs.github.com/en/enterprise-server@3.20…	release-notes
https://docs.github.com/en/enterprise-server@3.19…	release-notes
https://docs.github.com/en/enterprise-server@3.18…	release-notes
https://docs.github.com/en/enterprise-server@3.17…	release-notes
https://docs.github.com/en/enterprise-server@3.16…	release-notes

Impacted products

1 product

Vendor	Product	Version
GitHub	Enterprise Server	Affected: 3.21.0 , < 3.21.1 (semver) Affected: 3.20.0 , ≤ 3.20.2 (semver) Affected: 3.19.0 , ≤ 3.19.6 (semver) Affected: 3.18.0 , ≤ 3.18.9 (semver) Affected: 3.17.0 , ≤ 3.17.15 (semver) Affected: 3.16.0 , ≤ 3.16.18 (semver)

Credits

R31n

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-8606

Vulnerability from fkie_nvd - Published: 2026-05-27 00:16 - Updated: 2026-07-23 11:10

Severity

5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Summary

References

URL	Tags
product-cna@github.com	https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.19	Product, Release Notes
product-cna@github.com	https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.16	Product, Release Notes
product-cna@github.com	https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.10	Product, Release Notes
product-cna@github.com	https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.7	Product, Release Notes
product-cna@github.com	https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.3	Product, Release Notes
product-cna@github.com	https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.1	Product, Release Notes

Impacted products

Vendor	Product	Version
github	enterprise_server	*
github	enterprise_server	*
github	enterprise_server	*
github	enterprise_server	*
github	enterprise_server	*
github	enterprise_server	3.21.0

JSON

To clipboard

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              "criteria": "cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "4FF939CE-B42A-4091-ACF0-AF80FFBFDC25",
              "versionEndExcluding": "3.19.7",
              "versionStartIncluding": "3.19.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "BA3298CD-3841-491D-8056-7AC03FC6473F",
              "versionEndExcluding": "3.20.3",
              "versionStartIncluding": "3.20.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:github:enterprise_server:3.21.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "5CA62620-E9BF-4544-ACA8-1F2158F1D755",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A Server-Side Request Forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed an attacker to cause the server to issue HTTP requests to internal services via the security advisories package lookup feature. By directing requests to an internal management service and measuring response timing, an attacker could infer the values of sensitive environment variables, including signing secrets and private keys. Exploitation required GitHub Packages to be enabled; on instances not running in private mode the vulnerability was exploitable without authentication, otherwise any authenticated user could exploit it. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21.1 and was fixed in versions 3.20.3, 3.19.7, 3.18.10, 3.17.16, and 3.16.19. This vulnerability was reported via the GitHub Bug Bounty program."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de falsificaci\u00f3n de petici\u00f3n del lado del servidor (SSRF) fue identificada en GitHub Enterprise Server que permit\u00eda a un atacante hacer que el servidor emitiera peticiones HTTP a servicios internos a trav\u00e9s de la funci\u00f3n de b\u00fasqueda de paquetes de avisos de seguridad. Al dirigir peticiones a un servicio de gesti\u00f3n interno y medir el tiempo de respuesta, un atacante podr\u00eda inferir los valores de variables de entorno sensibles, incluyendo secretos de firma y claves privadas. La explotaci\u00f3n requer\u00eda que GitHub Packages estuviera habilitado; en instancias que no se ejecutaban en modo privado, la vulnerabilidad era explotable sin autenticaci\u00f3n, de lo contrario, cualquier usuario autenticado podr\u00eda explotarla. Esta vulnerabilidad afectaba a todas las versiones de GitHub Enterprise Server anteriores a la 3.21.1 y fue corregida en las versiones 3.20.3, 3.19.7, 3.18.10, 3.17.16 y 3.16.19. Esta vulnerabilidad fue reportada a trav\u00e9s del programa GitHub Bug Bounty."
    }
  ],
  "id": "CVE-2026-8606",
  "lastModified": "2026-07-23T11:10:00.120",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "HIGH",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 7.0,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "HIGH",
          "subIntegrityImpact": "HIGH",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "LOW",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "product-cna@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-8606",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-05-27T13:50:00.819968Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-05-27T00:16:37.900",
  "references": [
    {
      "source": "product-cna@github.com",
      "tags": [
        "Product",
        "Release Notes"
      ],
      "url": "https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.19"
    },
    {
      "source": "product-cna@github.com",
      "tags": [
        "Product",
        "Release Notes"
      ],
      "url": "https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.16"
    },
    {
      "source": "product-cna@github.com",
      "tags": [
        "Product",
        "Release Notes"
      ],
      "url": "https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.10"
    },
    {
      "source": "product-cna@github.com",
      "tags": [
        "Product",
        "Release Notes"
      ],
      "url": "https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.7"
    },
    {
      "source": "product-cna@github.com",
      "tags": [
        "Product",
        "Release Notes"
      ],
      "url": "https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.3"
    },
    {
      "source": "product-cna@github.com",
      "tags": [
        "Product",
        "Release Notes"
      ],
      "url": "https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.1"
    }
  ],
  "sourceIdentifier": "product-cna@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ],
      "source": "product-cna@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-3W49-FQ5G-G3Q6

Vulnerability from github – Published: 2026-05-27 00:31 – Updated: 2026-06-01 21:30

Details

Severity

5.9 (Medium)


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

7.0 (High)


                  
                    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-8606"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T00:16:37Z",
    "severity": "HIGH"
  },
  "details": "A Server-Side Request Forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed an attacker to cause the server to issue HTTP requests to internal services via the security advisories package lookup feature. By directing requests to an internal management service and measuring response timing, an attacker could infer the values of sensitive environment variables, including signing secrets and private keys. Exploitation required GitHub Packages to be enabled; on instances not running in private mode the vulnerability was exploitable without authentication, otherwise any authenticated user could exploit it. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21.1 and was fixed in versions 3.20.3, 3.19.7, 3.18.10, 3.17.16, and 3.16.19. This vulnerability was reported via the GitHub Bug Bounty program.",
  "id": "GHSA-3w49-fq5g-g3q6",
  "modified": "2026-06-01T21:30:35Z",
  "published": "2026-05-27T00:31:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-8606"
    },
    {
      "type": "WEB",
      "url": "https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.19"
    },
    {
      "type": "WEB",
      "url": "https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.16"
    },
    {
      "type": "WEB",
      "url": "https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.10"
    },
    {
      "type": "WEB",
      "url": "https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.7"
    },
    {
      "type": "WEB",
      "url": "https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.3"
    },
    {
      "type": "WEB",
      "url": "https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

WID-SEC-W-2026-1682

Vulnerability from csaf_certbund - Published: 2026-05-26 22:00 - Updated: 2026-05-26 22:00

Summary

Microsoft GitHub Enterprise: Mehrere Schwachstellen ermöglichen Offenlegung von Informationen

Severity

Hoch

Scope

2 vulnerabilities in this advisory, including CVE-2026-8606.

CVE-2026-8606

Known affected: 6 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-2026-8606 (GCVE-0-2026-8606)

FKIE_CVE-2026-8606

GHSA-3W49-FQ5G-G3Q6

WID-SEC-W-2026-1682

Tags

Sightings

Nomenclature

Related by attack behaviour