CVE-2026-19118

A time-of-check time-of-use race condition vulnerability was identified in GitHub Enterprise Server that allowed remote code execution. Exploitation required an authenticated user with write access to a repository and precise timing of concurrent upload requests. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.17.20, 3.18.14, 3.19.11, 3.20.7, and 3.21.5. This vulnerability was reported via the GitHub Bug Bounty program.

• CWE-367

• https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.20Release Notes, Vendor Advisory
• https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.14Release Notes, Vendor Advisory
• https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.11Release Notes, Vendor Advisory
• https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.7Release Notes, Vendor Advisory
• https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.5Release Notes, Vendor Advisory

Published

Sep 1, 2026

Last Modified

Sep 8, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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