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CVE-2026-3854

8.8 · HIGH

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…

Published Mar 10, 2026CWE-77EPSS 1.50%

Overview

CVE-2026-3854 is a high-severity vulnerability. It was published on March 10, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubdocs.github.com/en/[email protected]/admin/release-notes#3.14.25GitHubdocs.github.com/en/[email protected]/admin/release-notes#3.15.20GitHubdocs.github.com/en/[email protected]/admin/release-notes#3.16.16GitHubdocs.github.com/en/[email protected]/admin/release-notes#3.17.13GitHubdocs.github.com/en/[email protected]/admin/release-notes#3.18.7GitHubdocs.github.com/en/[email protected]/admin/release-notes#3.19.4Refwww.wiz.io/blog/github-rce-vulnerability-cve-2026-3854

How CyberStrike helps

Frequently asked questions

What is CVE-2026-3854?

CVE-2026-3854 is a high-severity vulnerability. It was published on March 10, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-3854?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-3854?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-3854?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-3854 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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