CVE-2026-110264 GitLab CVE debrief

Who should care

GitLab administrators, security teams, and developers using GitLab CE/EE should assess exposure and prioritize patching or mitigation. They should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. Additionally, they should plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Why it matters

CVE-2026-110264 is a critical vulnerability in GitLab CE/EE that allows unauthenticated users to execute arbitrary code. Defenders should prioritize patching or mitigating this vulnerability, especially for exposed GitLab instances.

• Potential for arbitrary code execution on GitLab servers
• Exposure of GitLab instances to unauthenticated users
• Need for patching or mitigating vulnerable versions
• Verification of instance exposure and version checks

Technical summary

The vulnerability is caused by an integer overflow when compiling a specially crafted regular expression, allowing unauthenticated users to execute arbitrary code on the GitLab server. This issue affects multiple versions of GitLab CE/EE, including 7.0 before 18.11.13, 19.0 before 19.0.10, 19.1 before 19.1.9, 19.2 before 19.2.9, 19.3 before 19.3.6, 19.4 before 19.4.3, and 19.5 before 19.5.1. The vulnerability has a CVSS score of 10 and a severity of CRITICAL. Defenders should prioritize patching or mitigating this vulnerability, especially for exposed GitLab instances.

Defensive priority

Defenders should prioritize patching or mitigating this vulnerability, especially for exposed GitLab instances.

Recommended defensive actions

• Patch GitLab instances to version 18.11.13, 19.0.10, 19.1.9, 19.2.9, 19.3.6, 19.4.3, or 19.5.1
• Restrict access to GitLab instances for unauthenticated users
• Monitor GitLab instances for suspicious activity
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including affected versions and CVSS score. The vulnerability affects GitLab CE/EE versions 7.0 to 19.5.0. Defenders should verify instance exposure and version checks. The issue allows unauthenticated users to execute arbitrary code on the GitLab server due to integer overflow when compiling a specially crafted regular expression. Evidence is limited to public CVE details and NVD entry.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.