CVE-2026-19118
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductGithub Enterprise Server
PublishedSep 1, 2026
First seenSep 1, 2026
Weakness typeCWE-367CWE-367
How to fix
Update
- github enterprise_server3.17.20, 3.18.14, 3.19.11, 3.20.7, 3.21.5 or later
Vendor advisories
- docs.github.com/en/[email protected]/admin/release-notes#3.17.20
- docs.github.com/en/[email protected]/admin/release-notes#3.18.14
- docs.github.com/en/[email protected]/admin/release-notes#3.19.11
- docs.github.com/en/[email protected]/admin/release-notes#3.20.7
- docs.github.com/en/[email protected]/admin/release-notes#3.21.5
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| github enterprise_server | v < 3.17.20, 3.18.0 ≤ v < 3.18.14, 3.19.0 ≤ v < 3.19.11, 3.20.0 ≤ v < 3.20.7, 3.21.0 ≤ v < 3.21.5 | 3.17.20, 3.18.14, 3.19.11, 3.20.7, 3.21.5 |
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