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.
Metrics
Affected Vendors & Products
References
History
Wed, 27 May 2026 01:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Github
Github enterprise Server |
|
| Vendors & Products |
Github
Github enterprise Server |
Wed, 27 May 2026 00:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | Server-Side Request Forgery in GitHub Enterprise Server via Advisory Package URL Endpoint | |
| Weaknesses | CWE-918 | |
| References |
|
|
| Metrics |
cvssV4_0
|
Status: PUBLISHED
Assigner: GitHub_P
Published:
Updated: 2026-05-26T23:59:41.742Z
Reserved: 2026-05-14T15:28:24.899Z
Link: CVE-2026-8606
No data.
Status : Received
Published: 2026-05-27T00:16:37.900
Modified: 2026-05-27T00:16:37.900
Link: CVE-2026-8606
No data.
OpenCVE Enrichment
Updated: 2026-05-27T01:30:16Z