CVE-2026-19118CWE-367

CVE-2026-19118

High · published September 2, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
52.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
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
EPSS
0.00688 · 52.2th percentile
Weakness
CWE-367 · Time-of-check Time-of-use (TOCTOU) Race Condition
Published
2026-09-02T02:17Z
Affected products (5)
ProductVersionsFixed in
github/enterprise_server< 3.17.203.17.20
github/enterprise_server≥ 3.18.0, < 3.18.143.18.14
github/enterprise_server≥ 3.19.0, < 3.19.113.19.11
github/enterprise_server≥ 3.20.0, < 3.20.73.20.7
github/enterprise_server≥ 3.21.0, < 3.21.53.21.5
References (5)
https://docs.github.com/en/[email protected]/admin/release-notes#3.17.20 · [email protected]https://docs.github.com/en/[email protected]/admin/release-notes#3.18.14 · [email protected]https://docs.github.com/en/[email protected]/admin/release-notes#3.19.11 · [email protected]https://docs.github.com/en/[email protected]/admin/release-notes#3.20.7 · [email protected]https://docs.github.com/en/[email protected]/admin/release-notes#3.21.5 · [email protected]
EPSS history
Timeline
  • 03 SEP 03:28Z
    EPSS moved — → 0%
    epss
  • 01 SEP 21:55Z
    Race condition vulnerability was identified in GitHub Enterprise Server that allowed remote code execution
    cvelistv5