# CVE-2026-19118

## Summary

- **CVE ID:** CVE-2026-19118
- **Severity:** HIGH
- **CVSS Score:** 7.7 (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)
- **CWE:** CWE-367
- **Published:** Sep 1, 2026
- **Last Modified:** Sep 2, 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, 3.21.5, and 3.22.0. This vulnerability was reported via the GitHub Bug Bounty program.

## Affected Products

- GitHub — Enterprise Server (3.17.0)
- GitHub — Enterprise Server (3.18.0)
- GitHub — Enterprise Server (3.19.0)
- GitHub — Enterprise Server (3.20.0)
- GitHub — Enterprise Server (3.21.0)
- GitHub — Enterprise Server (3.22.0)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.53%
- **EPSS Percentile:** 43.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._