CVE-2026-19118

Race condition vulnerability was identified in GitHub Enterprise Server that allowed remote code execution

State: Published
Severity: 7.7 High
Published: Sep 1, 2026
Updated: Sep 2, 2026
Reserved: Aug 6, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	7.7 High	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	GitHub_P

Weaknesses

CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

Affected Products

Product	Versions
Enterprise ServerGitHub	3.17.0 through 3.17.19Affectedfrom 3.17.20Not affected 3.18.0 through 3.18.13Affectedfrom 3.18.14Not affected 3.19.0 through 3.19.10Affectedfrom 3.19.11Not affected 3.20.0 through 3.20.6Affectedfrom 3.20.7Not affected 3.21.0 through 3.21.4Affectedfrom 3.21.5Not affected 3.22.0Not affected

References

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

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