External risk intelligence

GitLab Regular Expression Integer Overflow Allows Unauthenticated Code Execution.

CVE advisorySeverity: CRITICAL (CVSS 10.0)

CVE-2026-110264

GitLab is a web-based platform typically deployed as a public-facing application, API, or service. Because it is designed to be accessible for collaboration, development, and integration tasks, it is commonly exposed directly to the internet in normal deployments.

Integer Overflow

Halo Surface Signal: 5 out of 5 — more likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This vulnerability affects GitLab, a platform used for software development and collaboration. An unauthenticated user could potentially execute arbitrary code on the server by exploiting an integer overflow flaw when compiling a specially crafted regular expression. The main concern is confirming relevance and exposure.

Unauthenticated code execution possible in GitLab.
Affects platform integrity and external access.
Confirm relevance and assess exposure for GitLab.

Attack Path

How an attacker could exploit the issue

An attacker could target GitLab servers accessible from the internet. By sending a specifically crafted regular expression, they could exploit an integer overflow vulnerability. This could potentially allow them to execute arbitrary code on the server.

Unauthenticated network access required.
Specially crafted regular expression triggers overflow.
Arbitrary code execution on the server.

Live Threat

Current exploitation, exposure, and threat context

An unauthenticated user could potentially execute arbitrary code on a GitLab server by crafting a regular expression that triggers an integer overflow during compilation. This could affect the GitLab server's overall integrity and availability.

Server code execution.
Crafted regular expressions.
Server compromise.

Operational Fix

Recommended remediation, mitigation, and detection steps

Given that GitLab is a web-based platform commonly exposed to the internet, platform or infrastructure teams are likely responsible for managing its instances. The first practical step is to identify all GitLab deployments, assess their exposure and business criticality, and then confirm the accountable owner to plan remediation.

Confirm GitLab instance ownership.
Verify network exposure and business impact.
Plan remediation during a maintenance window.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is GitLab and what is it used for?

GitLab is a comprehensive software development platform that integrates version control, CI/CD pipelines, and collaboration tools. Teams use it to host code repositories, automate testing and deployment, and manage project workflows. It serves as a central hub where developers track changes, review code, and coordinate the entire software delivery lifecycle within an organization.

What does CVE-2026-110264 mean for system security?

This CVE involves an integer overflow vulnerability, classified as CWE-190. In simple terms, this means the system makes a mathematical error when processing complex data. Because this error occurs during the compilation of a specially crafted regular expression, it can allow an attacker to bypass security controls and execute arbitrary commands on the underlying server, potentially granting them full control over the application.

How is this integer overflow vulnerability triggered?

An attacker triggers this flaw by submitting a specially crafted regular expression to the GitLab server. The vulnerability exists in the way the application calculates memory or data handling requirements during the compilation process. It is important to note that standard, legitimate user interactions or simple search queries do not trigger this issue; it requires a specifically malicious payload designed to cause the integer overflow.

Why is this CVE considered relevant for my infrastructure?

This vulnerability is highly relevant because GitLab is typically deployed as a public-facing service to facilitate developer collaboration and integration tasks. According to Halo Surface Signal, because GitLab is designed for external access, many instances are directly exposed to the internet. If your instance is reachable from the network without authentication, it is a potential target for this type of attack.

What are the first steps to address this GitLab issue?

The immediate priority is to locate all GitLab instances in your environment and determine who is responsible for their maintenance. Once you identify the owners, verify the network exposure of these systems and evaluate their business criticality. Coordinate with the relevant teams to plan and apply the necessary vendor-provided updates during a scheduled maintenance window to mitigate the risk.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.