githubCVE-2026-19118
A time-of-check time-of-use race condition vulnerability was identified in GitHub Enterprise Server that allowed remote code execution.
High7.7CVE-2026-19118 · Published Sep 1, 2026 · updated Sep 8, 2026
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Enterprise Server Vendor | >= 3.17.0, <= 3.17.19 | No fix yet |
| >= 3.18.0, <= 3.18.13 | No fix yet | |
| >= 3.19.0, <= 3.19.10 | No fix yet | |
| >= 3.20.0, <= 3.20.6 | No fix yet |
Details and references
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.
- CVSS 4.0
- 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Severity from
- no source yet
- Weakness
- CWE-367
- www.cve.org/CVERecord?id=CVE-2026-19118
- nvd.nist.gov/vuln/detail/CVE-2026-19118
- docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.20
- docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.14
- docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.11
- docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.7
- docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.5