Critical GitLab RCE Vulnerability CVE-2024-4024 Patched

Key Takeaways

• GitLab has issued urgent patches for a critical unauthenticated remote code execution (RCE) vulnerability, CVE-2026-110264.
• The flaw, affecting both GitLab Community Edition (CE) and Enterprise Edition (EE) versions dating back to 2014, carries a maximum CVSS score of 10.0.
• Self-managed GitLab instances are at immediate risk and require prompt upgrading to patched versions.
• GitLab.com and certain GitLab Dedicated tenants are already secured or do not require action.

GitLab Patches Critical RCE Vulnerability in Self-Managed Instances

GitLab has released emergency security updates to address a severe remote code execution (RCE) vulnerability, identified as CVE-2026-110264. This critical flaw, which boasts the highest possible CVSS score of 10.0, could enable attackers to execute arbitrary code on self-managed GitLab servers without needing authentication. The patches were made available on October 21, 2026, impacting both GitLab Community Edition (CE) and Enterprise Edition (EE).

The vulnerability’s root cause can be traced back to GitLab version 7.0, originally released in 2014, indicating a potential twelve-year window during which the flaw existed in the codebase. While the advisory outlines the significant risk, GitLab has not reported any confirmed active exploitation or publicly disclosed an exploit at this time.

Details of the Remote Code Execution Flaw

According to GitLab’s official security advisory, the vulnerability stems from an integer overflow that occurs when the server processes a specially crafted regular expression. Regular expressions are fundamental patterns used for text matching. Under specific, undisclosed conditions, the handling of an attacker-controlled pattern could lead to arbitrary code execution on the affected server.

GitLab’s CVSS assessment categorizes this as a network-based attack requiring low complexity, no elevated privileges, and no user interaction. The potential impact on data confidentiality, integrity, and system availability is rated as high. However, the company has not yet divulged the complete set of circumstances necessary to trigger the vulnerable code path. Security researcher joaxcar was credited for reporting this issue through GitLab’s HackerOne bug bounty program. The release notes also mention Ruby regular-expression patches, providing some insight into the affected software layer without revealing a full attack chain. Administrators should refrain from assuming the flaw is confined to specific projects or features unless GitLab explicitly confirms such limitations.

Affected Versions and Available Fixes

The CVE-2026-110264 vulnerability impacts all GitLab CE and EE versions starting from 7.0. GitLab has issued fixes in the following versions: 18.11.13, 19.0.10, 19.1.9, 19.2.9, 19.3.6, 19.4.3, and 19.5.1. Any earlier releases within these branches remain vulnerable. Notably, GitLab extended patching to four older branches beyond its typical support cycle to address the widespread nature of this vulnerability.

Self-managed customers are urged to upgrade their instances immediately. GitLab.com environments have already been updated with the necessary patches. For GitLab Dedicated tenants, those running 19.3.5-internal0, 19.4.2-internal0, or newer versions already incorporate the fixes and do not require further action. GitLab’s policy dictates that if an advisory does not specify a particular deployment type, all deployment types are considered affected.

It is important to distinguish this vulnerability from a separate GitLab code execution flaw, CVE-2026-97229, which was patched on October 12. Although both involved regular-expression handling, they affected different version ranges. Installing the earlier update does not mitigate the newly disclosed CVE-2026-110264.

GitLab has also released two detection guides for self-managed environments, titled “Onigmo native worker crash” and “Org mode render error burst.” These resources are designed to assist security teams in identifying potential exploitation attempts, though their publication does not confirm active attacks. The release notice explicitly states that these signals are not definitive proof of a successful compromise.

In total, the patch release addresses 12 vulnerabilities. Among these, CVE-2026-15723, rated 8.2 CVSS, is a serious issue where an authenticated attacker could hijack an existing LDAP-backed account if OmniAuth SAML and LDAP auto-linking are both enabled. Another flaw, CVE-2026-112212 (CVSS 7.5), involves poisoned OAuth and OpenID Connect discovery responses that could redirect certain authentication flows to an attacker-controlled server.

These updates follow other recent GitLab security advisories, including one concerning an AI Gateway remote command execution vulnerability. Given that these reports pertain to distinct components and attack vectors, precise version checking is crucial rather than assuming a single GitLab update covers all related products.

Administrators should carefully review GitLab’s upgrade instructions prior to deployment. The company warns that database migrations may impact the process, potentially leading to downtime for single-node installations. However, zero-downtime procedures are available for suitably configured multi-node setups.

Versions 19.3.6 and 19.4.3 include standard migrations. GitLab typically makes full technical details of security issues public 90 days after patching. Security teams should not delay updates while awaiting these comprehensive details.

These GitLab fixes coincide with security updates for other widely used web technologies, including Node.js and PHP. Node.js released patches for ten vulnerabilities across its 26.x, 24.x, and 22.x branches, with patched versions being 26.12.1, 24.22.1, and 22.23.4. Concurrently, PHP issued emergency patches for PHP2Shell, addressing two critical memory-handling flaws tracked as CVE-2026-109618 and CVE-2026-109619.

What You Should Do

• Upgrade Immediately: Self-managed GitLab CE/EE users must upgrade to one of the patched versions (18.11.13, 19.0.10, 19.1.9, 19.2.9, 19.3.6, 19.4.3, or 19.5.1) as soon as possible.
• Review Upgrade Instructions: Consult GitLab’s official upgrade documentation, paying close attention to database migration considerations to minimize downtime.
• Monitor for Exploitation: Utilize the “Onigmo native worker crash” and “Org mode render error burst” detection guides provided by GitLab to identify any potential exploitation attempts.
• Stay Informed: Keep an eye on GitLab’s security advisories for further details and future updates, especially regarding the full technical specifics of CVE-2026-110264.

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