# CVE-2026-3854: Remote code execution via git push option injection in GitHub Enterprise Server

> CVE-2026-3854: Remote code execution via git push option injection in GitHub Enterprise Server. CVSS 8.8 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-3854
Last updated: 2026-06-17T10:44:20Z

- Published: 2026-03-10 17:37 UTC · Updated: 2026-06-17 10:44 UTC · Assigner: GitHub\_P
- CVSS: 8.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS: 39.1%, 99th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-77

## Description

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.

## Affected vendors and products

- GitHub: Enterprise Server

## Tracked companies

- [GitHub](https://rewindex.com/company/github.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-3854)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-3854)
- [https://docs.github.com/en/enterprise-server@3.14/admin/release-notes\#3.14.25](https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.25)
- [https://docs.github.com/en/enterprise-server@3.15/admin/release-notes\#3.15.20](https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.20)
- [https://docs.github.com/en/enterprise-server@3.16/admin/release-notes\#3.16.16](https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.16)
- [https://docs.github.com/en/enterprise-server@3.17/admin/release-notes\#3.17.13](https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.13)
- [https://docs.github.com/en/enterprise-server@3.18/admin/release-notes\#3.18.7](https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.7)
- [https://docs.github.com/en/enterprise-server@3.19/admin/release-notes\#3.19.4](https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.4)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-3854 · Markdown: https://rewindex.com/cve/CVE-2026-3854.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-3854 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:12:23.909Z