CVE-2026-8606A 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…
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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.
- CVSS
- 5.9 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weakness (CWE)
- CWE-918
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jul 23, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
github enterprise_server github:enterprise_server | before 3.16.19; from 3.17.0 before 3.17.16; from 3.18.0 before 3.18.10; from 3.19.0 before 3.19.7; from 3.20.0 before 3.20.3; 3.21.0 | NVD |
References
- https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.19product, release-notes
- https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.16product, release-notes
- https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.10product, release-notes
- https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.7product, release-notes
- https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.3product, release-notes
- https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.1product, release-notes
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.