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

Quick assessment

Affected
GitHub Enterprise Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 GitHub Enterprise Server 中发现了时间检查与时间使用（Time-of-Check Time-of-Use, TOCTOU）竞争条件漏洞，该漏洞可导致远程代码执行。利用该漏洞需要一个对目标仓库具有写权限的已认证用户，并且需要精确把握并发上传请求的时序。该漏洞影响所有低于 3.22 版本的 GitHub Enterprise Server，并在版本 3.17.20、3.18.14、3.19.11、3.20.7、3.21.5 和 3.22.0 中修复。该漏洞是通过 GitHub 漏洞赏金计划报

CVSS 7.7 · High
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I. Basic Information for CVE-2026-19118

Vulnerability Information
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Vulnerability Title
Race condition vulnerability was identified in GitHub Enterprise Server that allowed remote code execution
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
GitHub Enterprise Server 3.17.0 ~ 3.17.19 -

II. Public POCs for CVE-2026-19118

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III. Intelligence Information for CVE-2026-19118

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Other References for CVE-2026-19118 (5)

Same Patch Batch · GitHub · 2026-09-01 · 3 CVEs total

CVE-2026-18730 8.2 HIGH Server-side request forgery vulnerability in GitHub Enterprise Server Manage API leaked a
CVE-2026-76851 7.7 HIGH Server-Side Request Forgery vulnerability in GitHub Enterprise Server allowed remote code

IV. Related Vulnerabilities

Same product: Enterprise Server
Same vendor: GitHub
Same weakness: CWE-367

V. Comments for CVE-2026-19118

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