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Vulnerability record · CVE-2026-3854 · published 10 March 2026

CVE-2026-3854: Github enterprise server command injection vulnerability

Github · Enterprise Server

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.

8.7 CVSS 4.0 High EPSS 1.4% · top 27.7% CWE-77 · Command injection
8.7CVSS 4.0 base score
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
17 Jun 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2026-3854), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.