Title: Enterprise Server de GitHub, Description: Una vulnerabilidad de falsificación de petición del lado del servidor (SSRF) fue identificada en GitHub Enterprise Server que permitía a un atacante hacer que el servidor emitiera peticiones HTTP a servicios internos a través de la función de búsqueda de paquetes de avisos de seguridad. Al dirigir peticiones a un servicio de gestión interno y medir el tiempo de respuesta, un atacante podría inferir los valores de variables de entorno sensibles, incluyendo secretos de firma y claves privadas. La explotación requería que GitHub Packages estuviera habilitado; en instancias que no se ejecutaban en modo privado, la vulnerabilidad era explotable sin autenticación, de lo contrario, cualquier usuario autenticado podría explotarla. Esta vulnerabilidad afectaba a todas las versiones de GitHub Enterprise Server anteriores a la 3.21.1 y fue corregida en las versiones 3.20.3, 3.19.7, 3.18.10, 3.17.16 y 3.16.19. Esta vulnerabilidad fue reportada a través del programa GitHub Bug Bounty.

{"timestamp":"2026-05-27T13:50:00.819968Z","id":"CVE-2026-8606","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}

[{"vendor":"GitHub","product":"Enterprise Server","defaultStatus":"unaffected","versions":[{"version":"3.21.0","lessThan":"3.21.1","versionType":"semver","status":"affected","changes":[{"at":"3.21.1","status":"unaffected"}]},{"version":"3.20.0","lessThanOrEqual":"3.20.2","versionType":"semver","status":"affected","changes":[{"at":"3.20.3","status":"unaffected"}]},{"version":"3.19.0","lessThanOrEqual":"3.19.6","versionType":"semver","status":"affected","changes":[{"at":"3.19.7","status":"unaffected"}]},{"version":"3.18.0","lessThanOrEqual":"3.18.9","versionType":"semver","status":"affected","changes":[{"at":"3.18.10","status":"unaffected"}]},{"version":"3.17.0","lessThanOrEqual":"3.17.15","versionType":"semver","status":"affected","changes":[{"at":"3.17.16","status":"unaffected"}]},{"version":"3.16.0","lessThanOrEqual":"3.16.18","versionType":"semver","status":"affected","changes":[{"at":"3.16.19","status":"unaffected"}]}]}]

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

OR
          *cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:* versions up to (excluding) 3.16.19
          *cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:* versions from (including) 3.17.0 up to (excluding) 3.17.16
          *cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:* versions from (including) 3.18.0 up to (excluding) 3.18.10
          *cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:* versions from (including) 3.19.0 up to (excluding) 3.19.7
          *cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:* versions from (including) 3.20.0 up to (excluding) 3.20.3
          *cpe:2.3:a:github:enterprise_server:3.21.0:*:*:*:*:*:*:*

GitHub, Inc. (Products Only): https://docs.github.com/en/[email protected]/admin/release-notes#3.16.19 Types: Product, Release Notes

GitHub, Inc. (Products Only): https://docs.github.com/en/[email protected]/admin/release-notes#3.17.16 Types: Product, Release Notes

GitHub, Inc. (Products Only): https://docs.github.com/en/[email protected]/admin/release-notes#3.18.10 Types: Product, Release Notes

GitHub, Inc. (Products Only): https://docs.github.com/en/[email protected]/admin/release-notes#3.19.7 Types: Product, Release Notes

GitHub, Inc. (Products Only): https://docs.github.com/en/[email protected]/admin/release-notes#3.20.3 Types: Product, Release Notes

GitHub, Inc. (Products Only): https://docs.github.com/en/[email protected]/admin/release-notes#3.21.1 Types: Product, Release Notes

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.

AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CWE-918

https://docs.github.com/en/[email protected]/admin/release-notes#3.16.19

https://docs.github.com/en/[email protected]/admin/release-notes#3.17.16

https://docs.github.com/en/[email protected]/admin/release-notes#3.18.10

https://docs.github.com/en/[email protected]/admin/release-notes#3.19.7

https://docs.github.com/en/[email protected]/admin/release-notes#3.20.3

https://docs.github.com/en/[email protected]/admin/release-notes#3.21.1