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TI-2026-07562 Aliases CVE-2026-8606GHSA-3w49-fq5g-g3q6

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

Priority LOW 31CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
Present
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-918 and the CVSS impact.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00492 42nd percentileScored 2026-11-07
Fix Fixed Enterprise Server (GitHub): 3.21.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
GitHubEnterprise Server3.21.0 to before 3.21.1; 3.20.0 – 3.20.2; 3.19.0 – 3.19.6; 3.18.0 – 3.18.9; 3.17.0 – 3.17.15; 3.16.0 – 3.16.183.21.1Patch availableCNA
  • Enterprise Server VendorGitHub Affected 3.21.0 to before 3.21.1; 3.20.0 – 3.20.2; 3.19.0 – 3.19.6; 3.18.0 – 3.18.9; 3.17.0 – 3.17.15; 3.16.0 – 3.16.18 Fixed in 3.21.1 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*before 3.16.19; 3.17.0 to before 3.17.16; 3.18.0 to before 3.18.10; 3.19.0 to before 3.19.7; 3.20.0 to before 3.20.3VulnerableGitHub
cpe:2.3:a:github:enterprise_server:3.21.0:*:*:*:*:*:*:*3.21.0VulnerableGitHub
  • cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:* Versions before 3.16.19; 3.17.0 to before 3.17.16; 3.18.0 to before 3.18.10; 3.19.0 to before 3.19.7; 3.20.0 to before 3.20.3 Vulnerable ·GitHub
  • cpe:2.3:a:github:enterprise_server:3.21.0:*:*:*:*:*:*:* Versions 3.21.0 Vulnerable ·GitHub

Remediation

  • Fix · CNA Enterprise Server (GitHub) Fixed in 3.21.1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-8606
  2. 2026-10-03 Alias added: GHSA-3w49-fq5g-g3q6
  3. 2026-10-25 EPSS moved to the below the 50th percentile

References

Other 6

  • TI-2024-04632 An authentication bypass vulnerability was present in the GitHub Enterprise Server (GHES)… CVSS 4.0CRITICAL 10.0
  • TI-2024-00181 Unsafe Reflection in Github Enterprise Server leading to Command Injection CVSS 3.1CRITICAL 9.8
  • TI-2024-00466 Privilege Escalation by Code Injection in the Management Console in GitHub Enterprise Server CVSS 3.1HIGH 8.8
  • TI-2026-03340 Remote code execution via git push option injection in GitHub Enterprise Server CVSS 4.0HIGH 8.7
  • TI-2024-08804 Improper signature verification in GitHub Enterprise Server CVSS 4.0CRITICAL 9.5
  • TI-2026-08177 Server-side request forgery in GitHub Enterprise Server CVSS 4.0CRITICAL 9.2
See all 125 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences