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CVE-2026-19118: Race condition vulnerability was identified in GitHub Enterprise Server that allowed remote code execution

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-01 · updated 2026-09-08
• Weakness: CWE-367

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

• GitHub Enterprise Server: before 3.17.20; from 3.18.0 before 3.18.14; from 3.19.0 before 3.19.11; from 3.20.0 before 3.20.7; from 3.21.0 before 3.21.5 — fixed in 3.17.20, 3.18.14, 3.19.11, 3.20.7, 3.21.5

How to fix

Upgrade to a fixed version: GitHub Enterprise Server 3.17.20, 3.18.14, 3.19.11, 3.20.7. Check the vendor advisory for mitigations.

References

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

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