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TI-2026-84843 Aliases CVE-2026-118237GHSA-pgwg-cgmw-g38v

Out-of-bounds read in GitHub Enterprise Server leaks process memory

Priority LOW 24CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-125 and the CVSS impact.

Summary

GitHub Enterprise Server releases prior to 3.23 contain an out-of-bounds read (CWE-125) in the Git service (babeld). During host key proof, the SSH implementation sizes the session identifier by the current digest length, so an attacker with an account and SSH access can re-key to an algorithm with a longer hash and have adjacent process memory signed and returned to the client, where a limited amount may be recoverable.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00268 19th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
GitHubEnterprise Server3.19.0 and later; 3.20.0 and later; 3.21.0 and later; 3.22.0 and later—No fix listedCNA
  • Enterprise Server VendorGitHub Affected 3.19.0 and later; 3.20.0 and later; 3.21.0 and later; 3.22.0 and later Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*——GitHub
  • cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:* Versions — — ·GitHub

Remediation

Upgrade GitHub Enterprise Server to 3.22.3 on the 3.22 branch, 3.21.8 on the 3.21 branch, 3.20.10 on the 3.20 branch, or 3.19.14 on the 3.19 branch.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    GitHub Enterprise Server 3.19.*, 3.20.* and 2 more versions

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2026-84840 Use-after-free in GitHub Enterprise Server allows code executionPriority LOW 36
    • TI-2026-84842 GitHub Enterprise Server flaw lets attackers delete ChatOps settingsPriority LOW 23
    Show all 3 records →

Timeline

  1. 2026-11-03 Threatist record created from CVE-2026-118237
  2. 2026-11-04 Alias added: GHSA-pgwg-cgmw-g38v
  3. 2026-11-06 CISA SSVC decision points changed

References

Other 4

  • TI-2024-04632 An authentication bypass vulnerability was present in the GitHub Enterprise Server (GHES)… CVSS 4.0CRITICAL 10.0
  • TI-2024-00181 Unsafe Reflection in Github Enterprise Server leading to Command Injection CVSS 3.1CRITICAL 9.8
  • TI-2024-00466 Privilege Escalation by Code Injection in the Management Console in GitHub Enterprise Server CVSS 3.1HIGH 8.8
  • TI-2022-08539 Integer overflow in table parsing extension leads to heap memory corruption CVSS 3.1CRITICAL 9.8
  • TI-2026-34990 GitHub MCP Server: Nil Pointer Dereference DoS in completion/complete Handler CVSS 3.1HIGH 7.5
  • TI-2026-32884 GitHub Copilot CLI: Nested Bare Repository Can Execute Arbitrary Commands via core.fsmonitor CVSS 4.0HIGH 8.5
See all 178 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences