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Enterprise Server CVE-2026-3854

HIGH
Command Injection (CWE-77)
2026-03-10 product-cna@github.com
RCE Command Injection Enterprise Server
8.7
CVSS 4.0 · GitHub Advisory
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Severity by source

GitHub Advisory PRIMARY
8.7 HIGH
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:X/V:X/RE:X/U:X

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

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:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

4
Re-analysis Queued
Apr 17, 2026 - 18:22 vuln.today
cvss_changed
CVSS changed
Apr 17, 2026 - 18:22 NVD
8.8 (HIGH) 8.7 (HIGH)
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
CVE Published
Mar 10, 2026 - 18:19 nvd
HIGH 8.8

DescriptionGitHub Advisory

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 3.14.24, 3.15.19, 3.16.15, 3.17.12, 3.18.6 and 3.19.3.

Articles & Coverage 1

wiz.io CVE-2026-3854: Critical RCE in GitHub Git Infrastructure Apr 28, 2026

AnalysisAI

Remote code execution in GitHub Enterprise Server allows authenticated users with repository push access to execute arbitrary code via unsanitized push option values that bypass internal header validation. An attacker can inject malicious metadata fields by exploiting insufficient input sanitization in the git push operation handler. This high-severity vulnerability affects GitHub Enterprise Server versions prior to 3.14.24, 3.15.19, 3.16.15, 3.17.12, 3.18.6, and 3.19.3, with no patch currently available for all affected installations.

Technical ContextAI

Classified as CWE-77 (Command Injection). Affects the internal component of 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 fi

RemediationAI

Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.

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CVE-2026-3854 vulnerability details – vuln.today
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