CVE-2026-118237
Out-of-bounds read vulnerability in GitHub Enterprise Server allowed disclosure of process memory in the Git service
- State
- Published
- Severity
- 5.3 Medium
- Published
- Nov 3, 2026
- Updated
- Nov 3, 2026
- Reserved
- Oct 27, 2026
Description
An out-of-bounds read vulnerability was identified in GitHub Enterprise Server in the Git service (babeld). When proving possession of a host key, babeld's SSH implementation sized the session identifier by the current digest length rather than its own. An attacker with an account and SSH access could re-key to an algorithm with a longer hash, causing adjacent process memory to be signed and returned to the client, where a limited amount of it may be recoverable. This vulnerability affected all releases prior to 3.23 and was fixed in versions 3.22.3, 3.21.8, 3.20.10, and 3.19.14. This vulnerability was reported via the GitHub Bug Bounty program.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N | GitHub_P |
Weaknesses
- CWE-125 Out-of-bounds Read
Affected Products
| Product | Versions |
|---|---|
Enterprise ServerGitHub |
|
References
- https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.14release-notes
- https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.10release-notes
- https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.8release-notes
- https://docs.github.com/en/enterprise-server@3.22/admin/release-notes#3.22.3release-notes
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.