Remote code execution via git push option injection in GitHub Enterprise Server
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-77.
Summary
An improper neutralization of special elements vulnerability was identified in GitHub Enterprise Server that allowed an attacker with push access to a repository to achieve remote code execution on the instance. During a git push operation, user-supplied push option values were not properly sanitized before being included in internal service headers. Because the internal header format used a delimiter character that could also appear in user input, an attacker could inject additional metadata fields through crafted push option values. This vulnerability was reported via the GitHub Bug Bounty program and has been fixed in GitHub Enterprise Server versions 3.14.25, 3.15.20, 3.16.16, 3.17.13, 3.18.7 and 3.19.4.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| GitHub | Enterprise Server | 3.14.0 – 3.14.24; 3.15.0 – 3.15.19; 3.16.0 – 3.16.15; 3.17.0 – 3.17.12; 3.18.0 – 3.18.6; 3.19.0 – 3.19.3 | — | No fix listed | CNA |
- Enterprise Server VendorGitHub Affected 3.14.0 – 3.14.24; 3.15.0 – 3.15.19; 3.16.0 – 3.16.15; 3.17.0 – 3.17.12; 3.18.0 – 3.18.6; 3.19.0 – 3.19.3 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:* | before 3.14.24; 3.15.0 to before 3.15.19; 3.16.0 to before 3.16.15; 3.17.0 to before 3.17.12; 3.18.0 to before 3.18.6; 3.19.0 to before 3.19.3 | Vulnerable | GitHub |
- cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:* Versions before 3.14.24; 3.15.0 to before 3.15.19; 3.16.0 to before 3.16.15; 3.17.0 to before 3.17.12; 3.18.0 to before 3.18.6; 3.19.0 to before 3.19.3 Vulnerable ·GitHub
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-3854
- 2026-10-03 Alias added: GHSA-64fw-jx9p-5j24
- 2026-10-25 EPSS moved to the 95th–99th percentile
- 2026-10-25 Priority changed: MEDIUM → HIGH
References
Other 6
- https://docs.github.com/en/[email protected]/admin/release-notes#3.14.25
- https://docs.github.com/en/[email protected]/admin/release-notes#3.15.20
- https://docs.github.com/en/[email protected]/admin/release-notes#3.16.16
- https://docs.github.com/en/[email protected]/admin/release-notes#3.17.13
- https://docs.github.com/en/[email protected]/admin/release-notes#3.18.7
- https://docs.github.com/en/[email protected]/admin/release-notes#3.19.4
More GitHub Enterprise Server vulnerabilities
- 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-2024-08804 Improper signature verification in GitHub Enterprise Server CVSS 4.0CRITICAL 9.5
- TI-2026-08177 Server-side request forgery in GitHub Enterprise Server CVSS 4.0CRITICAL 9.2
- TI-2024-06303 Improper signature verification in GitHub Enterprise Server CVSS 4.0CRITICAL 9.5
Sources
- CVE-2026-3854 · CVE Program
- CVE-2026-3854 · NVD
- FIRST EPSS
- GHSA-64fw-jx9p-5j24 · GitHub Advisory Database · CC BY 4.0
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