High severity · published Sep 1, 2026
CVE-2026-19118
Race condition vulnerability was identified in GitHub Enterprise Server that allowed remote code execution
7.5
CVSS
0.9%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 60% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ES
Enterprise Server · GitHub
3.17.0 through 3.17.19; 3.18.0 through 3.18.13; 3.19.0 through 3.19.10; 3.20.0 through 3.20.6; 3.21.0 through 3.21.4 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-19118
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-19118
Release Notes
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
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