CVE-2026-8606 (GCVE-0-2026-8606)
Vulnerability from cvelistv5
Published
2026-05-26 23:59
Modified
2026-05-27 13:50
Severity ?
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
CWE
  • CWE-918 - Server-Side request forgery (SSRF)
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.
References
Impacted products
Vendor Product Version
GitHub Enterprise Server Version: 3.21.0   ≤
Version: 3.20.0   ≤ 3.20.2
Version: 3.19.0   ≤ 3.19.6
Version: 3.18.0   ≤ 3.18.9
Version: 3.17.0   ≤ 3.17.15
Version: 3.16.0   ≤ 3.16.18
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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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