Vulnerability · Published Nov 3, 2026 · Assigned by GitHub_P
CVE-2026-118237Out-of-bounds read vulnerability in GitHub Enterprise Server allowed disclosure of process memory in the Git service
Medium 5.3
In plain English
A medium-severity out-of-bounds read in Enterprise Server from GitHub. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| GitHub | Enterprise Server | 3.19.0 – before 3.19.*3.20.0 – before 3.20.*3.21.0 – before 3.21.*3.22.0 – before 3.22.* |
Weakness: CWE-125 · Vector: 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
References
- https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.14 release-notes
- https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.10 release-notes
- https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.8 release-notes
- https://docs.github.com/en/enterprise-server@3.22/admin/release-notes#3.22.3 release-notes