Vulnerability · Published Sep 1, 2026 · Assigned by GitHub_P
CVE-2026-19118Race condition vulnerability was identified in GitHub Enterprise Server that allowed remote code execution
High 7.7
In plain English
A high-severity security flaw in Enterprise Server from GitHub. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 60% of all known vulnerabilities).
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| GitHub | Enterprise Server | 3.17.0 – through 3.17.193.18.0 – through 3.18.133.19.0 – through 3.19.103.20.0 – through 3.20.63.21.0 – through 3.21.4 |
Weakness: CWE-367 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References
- https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.20 release-notes
- https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.14 release-notes
- https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.11 release-notes
- https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.7 release-notes
- https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.5 release-notes