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CVE-2026-8606

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 3.21.1
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • GitHub Enterprise Server

    From 3.21.0 · fixed in 3.21.1; From 3.20.0 · through 3.20.2; From 3.19.0 · through 3.19.6; From 3.18.0 · through 3.18.9; From 3.17.0 · through 3.17.15; From 3.16.0 · through 3.16.18

References 6

docs.github.com