CVE-2026-3854
HIGHEPSS 98th pctlDescription
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
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploit Intelligence
Very high risk: more likely to be exploited than 98% of all known CVEs.
References
- 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
- https://www.wiz.io/blog/github-rce-vulnerability-cve-2026-3854
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Start freeThis product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-28.