External risk intelligence

GitLab CI/CD Integer Overflow Allows Code Execution

CVE advisorySeverity: CRITICAL (CVSS 9.9)

CVE-2026-93577

GitLab instances are frequently deployed as internet-facing platforms for code hosting, CI/CD pipelines, and collaboration. While the vulnerability requires an authenticated user account and involves CI/CD configuration processing, the product itself is commonly exposed to the public internet or reachable via external web interfaces in standard enterprise and developer deployments.

Integer Overflow

Gitlab

19.2.0 to before 19.2.719.3.0 to before 19.3.319.4.0

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

GitLab has addressed a critical vulnerability that could allow an authenticated user to execute arbitrary code on the server. This issue stemmed from an integer overflow when processing specially crafted regular expressions within CI/CD configurations. While remediation has been applied to specific versions, it's important to confirm if your GitLab instance falls within the affected range to ensure the integrity of your systems.

Code execution flaw in GitLab CI/CD.
Critical risk to server integrity and data.
Confirm GitLab version relevance and exposure.

Attack Path

How an attacker could exploit the issue

An attacker with authenticated access to GitLab could exploit an integer overflow vulnerability when processing specially crafted regular expressions within CI/CD configurations. This could allow them to execute arbitrary code on the GitLab server, leading to a critical security breach.

Requires authenticated user access.
Triggers when compiling crafted regex.
Potential for arbitrary code execution.

Live Threat

Current exploitation, exposure, and threat context

An authenticated user could execute arbitrary code on the GitLab server when processing a specially crafted regular expression within a CI/CD configuration, due to an integer overflow.

Server code execution.
Malicious regex in CI/CD config.
Compromised server and data.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability impacts GitLab CE/EE instances. Application owners and platform teams are likely responsible for managing GitLab deployments. The first step is to identify all GitLab instances, confirm their exposure and business criticality, and then determine the accountable owner to plan remediation based on risk.

Confirm GitLab instance inventory and exposure.
Identify GitLab instance owners and criticality.
Plan remediation based on identified risk.

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 how is it used?

GitLab is a comprehensive software development platform used by teams to manage source code, track issues, and automate software delivery. It provides integrated CI/CD pipelines that automatically build, test, and deploy applications based on configurations defined in the code repository.

What does CVE-2026-93577 mean for GitLab security?

This vulnerability is an integer overflow issue, categorized as CWE-190. It occurs when the software performs mathematical operations that exceed the memory capacity allocated for them. In this case, processing a specifically crafted regular expression within a CI/CD configuration triggers this error, potentially allowing unauthorized code execution on the underlying server.

Do I need a special setup to trigger this vulnerability?

Yes, this bug is not triggered by casual browsing. An attacker must have an authenticated account on the GitLab instance to access CI/CD configuration settings. Simply viewing or using standard repository features without the ability to modify or define CI/CD configuration files does not trigger the flaw.

Is my GitLab instance at risk according to Halo Surface Signal?

Halo Surface Signal identifies GitLab as a platform frequently deployed as an internet-facing tool for collaboration and automated pipelines. Because these instances are often reachable via external web interfaces, the platform is inherently exposed, making it critical to verify if your specific version falls within the affected range.

How should I respond to this security update?

Start by auditing your infrastructure to create an inventory of all GitLab instances and their current versions. Once identified, compare your versions against the affected ranges provided in the security documentation. If your instance is affected, prioritize updating to the latest patched version to secure the CI/CD processing environment.

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.