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  4. CVE 2026 104608 use after free vulnerability in github enterprise
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Back to active CVEs
High · CVSS 7.7CVE-2026-104608

Use-after-free vulnerability in GitHub Enterprise Server allowed remote code execution in the Git serviceCVE-2026-104608

Answer in brief

CVE-2026-104608 records a High severity (CVSS 7.7) vulnerability in Use-after-free vulnerability in GitHub Enterprise Server allowed remote code execution in the Git service. The current sources do not mark it as known exploited. The current feed maps GitHub/Enterprise Server (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 3, 2026Updated Nov 3, 2026Source checked Nov 3, 2026First seen by HOL Nov 3, 2026Material review Nov 3, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.7
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 7.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps GitHub/Enterprise Server (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
GitHub/Enterprise Servergeneric>=3.19.0 <3.19.* || >=3.20.0 <3.20.* || >=3.21.0 <3.21.* || >=3.22.0 <3.22.*3.19.*, 3.20.*, 3.21.*, 3.22.*

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for GitHub/Enterprise Server.
  2. 2Review the reported fix. Update GitHub/Enterprise Server to 3.19.* if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 3, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 3, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 3, 2026

Sources and claim methodology

  • GitHub security advisorydocs.github.com
  • GitHub security advisorydocs.github.com
  • GitHub security advisorydocs.github.com
  • GitHub security advisorydocs.github.com
Upstream source description

A remote code execution vulnerability was identified in GitHub Enterprise Server in the Git service (babeld). babeld held references into internal collections while calling into the SSH library, where a re-entrant callback could modify a collection and invalidate those references. An attacker with an account and SSH access to the instance could leverage this use-after-free into a controlled write and run arbitrary commands as babeld, including disclosure of its environment secrets. Exploitation required per-build memory offsets; failed attempts crashed babeld. This affected all releases prior to 3.23 and was fixed in 3.22.3, 3.21.8, 3.20.10, and 3.19.14. This vulnerability was reported via the GitHub Bug Bounty program.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Cross-site request forgery vulnerability in GitHub Enterprise Server allowed deletion of stored ChatOps configuration through the Management ConsoleSame github/enterprise server package
  • Out-of-bounds read vulnerability in GitHub Enterprise Server allowed disclosure of process memory in the Git serviceSame github/enterprise server package

Record context

Vulnerability class
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-416, CWE-1265
Source
CVE List V5
Source checked
Nov 3, 2026
References
4 linked sources
Open source record