CVE-2026-118237
Out-of-bounds read vulnerability in GitHub Enterprise Server allowed disclosure of process memory in the Git service
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Enterprise Server GitHub |
≥ 3.19.0; < 3.19.* (affected, semver); unaffected at 3.19.14 ≥ 3.20.0; < 3.20.* (affected, semver); unaffected at 3.20.10 ≥ 3.21.0; < 3.21.* (affected, semver); unaffected at 3.21.8 ≥ 3.22.0; < 3.22.* (affected, semver); unaffected at 3.22.3 Other versions: unknown |
CNA: GitHub_P |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 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 | CNA: GitHub_P |
| 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | NVD: [email protected] |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://docs.github.com/en/[email protected]/admin/release-notes#3.19.14CNA: GitHub_P · release-notes
- https://docs.github.com/en/[email protected]/admin/release-notes#3.20.10CNA: GitHub_P · release-notes
- https://docs.github.com/en/[email protected]/admin/release-notes#3.21.8CNA: GitHub_P · release-notes
- https://docs.github.com/en/[email protected]/admin/release-notes#3.22.3CNA: GitHub_P · release-notes
- https://docs.github.com/en/[email protected]/admin/release-notes#3.19.14[email protected]
- https://docs.github.com/en/[email protected]/admin/release-notes#3.20.10[email protected]
- https://docs.github.com/en/[email protected]/admin/release-notes#3.21.8[email protected]
- https://docs.github.com/en/[email protected]/admin/release-notes#3.22.3[email protected]
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