CVE-2026-3854
As of 2026-04-28, CVE-2026-3854 is a CVSS 8.8 (HIGH-severity) vulnerability. EPSS exploitation probability 0.3%. Threadlinqs Intelligence tracks 2 threats exploiting it.
Last updated: 2026-04-28
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.
CVSS v3 vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weaknesses (CWE)
CWE-77
Threats tracking this CVE
- Wiz's Atlas AI Vulnerability Researcher Uncovers Critical GitHub RCE (CVE-2026-3854) and 200+ Unknown OSS Vulnerabilities — CRITICAL
- GitHub.com & GitHub Enterprise Server Pre-Auth RCE via X-Stat Header Field Injection (CVE-2026-3854) — HIGH
References
- 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@3.16/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@3.18/admin/release-notes#3.18.7
- https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.4
- https://www.wiz.io/blog/github-rce-vulnerability-cve-2026-3854
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Enriched from CVE.org, NVD (this product uses the NVD API but is not endorsed or certified by the NVD), FIRST EPSS, CISA KEV, and GitHub Security Advisories.