CVE-2026-8034

Vulnerability Description

A server-side request forgery (SSRF) vulnerability was identified in the GitHub Enterprise Server notebook viewer that allowed an attacker to access internal services by exploiting URL parser confusion between the validation layer and the HTTP request library. The hostname validation used a different URL parser than the request library, enabling a crafted URL to pass validation while directing the request to an unintended host. Exploitation required network access to the GitHub Enterprise Server instance. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.16.18, 3.17.15, 3.18.9, 3.19.6, and 3.20.2. This vulnerability was reported via the GitHub Bug Bounty program.

CVSS Score

Affected Products

Related Weaknesses (CWE)

References

• https://docs.github.com/en/[email protected]/admin/release-notes#3.16.18Release NotesVendor Advisory
• https://docs.github.com/en/[email protected]/admin/release-notes#3.17.15Release NotesVendor Advisory
• https://docs.github.com/en/[email protected]/admin/release-notes#3.18.9Release NotesVendor Advisory
• https://docs.github.com/en/[email protected]/admin/release-notes#3.19.6Release NotesVendor Advisory
• https://docs.github.com/en/[email protected]/admin/release-notes#3.20.2Release NotesVendor Advisory