GitLab Issues Critical Security Patch for CVE-2026-110264
The patch addresses a critical unauthenticated remote code execution flaw affecting all versions since 2014.
Updated on Oct. 21, 2026 in Cybersecurity
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GitLab has released security patches to resolve a critical unauthenticated remote code execution vulnerability, tracked as CVE-2026-110264, which carries a maximum CVSS score of 10.0. The flaw, caused by an integer overflow in the Onigmo regular-expression compiler, affects all self-managed software versions released since 7.0.
Why it matters
This vulnerability allows unauthenticated users to execute arbitrary code on affected servers, posing a severe security risk to self-managed instances. While no evidence of active exploitation has been reported, the scope of affected versions underscores the necessity for immediate patching.
The vulnerability involves an integer overflow during the compilation of regular expressions within the Onigmo engine. The October 21 update includes 11 total security fixes to address various system issues.
The players
GitLab
This organization develops and publishes an open-source software platform for the software development lifecycle.
CISA
The Cybersecurity and Infrastructure Security Agency is a U.S. government body that monitors known exploited vulnerabilities.
The details
The flaw specifically impacts users who applied the October 12 security updates for versions 19.2 and later. Administrators are encouraged to utilize Sigma-formatted rules provided in the TLDR framework to detect any potential exploitation attempts on their systems.
Timeline
2014: GitLab version 7.0 was first released.
September 23, 2026: GitLab fixed two separate remote code execution flaws.
October 12, 2026: Security updates for version 19.2 and later were released.
October 21, 2026: GitLab released the patches for CVE-2026-110264.
October 22, 2026: The vulnerability was confirmed as absent from the CISA known exploited list.
The Tech Race
This vulnerability is not currently listed in the U.S. CISA catalog of known exploited vulnerabilities, indicating its status as a newly disclosed threat. The rapid release of patches for multiple versions aligns with industry trends to address critical code flaws before they are weaponized by attackers.
Users of self-managed GitLab instances must immediately apply the latest patches to prevent potential unauthenticated access to their servers. Administrators should monitor system logs using the provided Sigma-formatted rules to ensure their environments remain secure against this threat.
The takeaway
Maintaining up-to-date software is the most effective defense against critical vulnerabilities that rely on deep-seated code flaws. Security teams should prioritize patching cycles that specifically address core compiler engines like Onigmo.
Further reading
Find more updates and defense strategies in the Cybersecurity section.
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