CVE-2026-7250: GitLab API Denial of Service Vulnerability (CVSS 7.5)

Technical summary

CVE-2026-7250 is a resource exhaustion vulnerability (CWE-770) in GitLab's API request parsing middleware. The flaw lies in improper input validation that fails to constrain request processing within safe limits. An unauthenticated, network-adjacent attacker can exploit this by crafting malicious API requests that consume excessive system resources, degrading or halting service availability. The vulnerability has a CVSS 3.1 score of 7.5 (HIGH) with a network attack vector, low complexity, and no privilege or interaction requirements. The impact is strictly availability; confidentiality and integrity are not affected.

Business impact

Denial-of-service attacks can prevent legitimate users and CI/CD pipelines from accessing GitLab repositories, managing projects, and executing automated workflows. For organizations relying on GitLab as their source control backbone, exploitation could halt development velocity, delay deployments, and disrupt collaboration. The unauthenticated nature of the attack means no insider access is required, expanding the threat surface. Depending on environment criticality and availability expectations, downtime can translate to direct revenue loss or reputational damage.

Affected systems

GitLab CE and EE versions 12.10 through 18.10.7, 18.11.0 through 18.11.4, and 19.0.0 through 19.0.1 are vulnerable. Versions 18.10.8, 18.11.5, and 19.0.2 or later contain fixes. Organizations should verify their installed version against GitLab's version history and check the official security advisory for any additional version lines that may have received backported patches.

Exploitability

The attack has a low barrier to entry. No authentication, special privileges, or user interaction is required—only network connectivity to the GitLab API. The attack complexity is low, meaning the exploit is straightforward and does not depend on race conditions or timing. This makes the vulnerability attractive to opportunistic attackers scanning for unpatched GitLab instances. However, the vulnerability is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, suggesting active exploitation in the wild has not yet been widely reported as of the advisory date.

Remediation

Patch immediately to GitLab 18.10.8, 18.11.5, or 19.0.2 or later, depending on your deployed version line. If immediate patching is not feasible, implement network-level controls to restrict unauthenticated access to GitLab's API endpoints, and monitor for anomalous request patterns that may indicate exploitation attempts. Consider temporarily disabling external API access if the instance is not required for external integrations.

Patch guidance

Consult GitLab's official security advisory and release notes to confirm patch availability for your specific version. Test patches in a non-production environment before deployment to ensure compatibility with your integrations and plugins. GitLab typically releases patches as point releases (e.g., 18.10.8); verify the exact version you need to upgrade to matches the affected range. If your installation is behind a major version, plan an upgrade path that may span multiple intermediate releases to avoid breaking changes.

Detection guidance

Monitor GitLab API logs for unusual traffic patterns, such as a spike in malformed or rejected requests from a single IP or set of IPs. Look for HTTP 400-level errors concentrated on API endpoints. Implement rate limiting and request size limits on your reverse proxy or load balancer in front of GitLab to mitigate resource exhaustion. Network intrusion detection systems (NIDS) may identify malicious request signatures once patterns are established; coordinate with your security operations team to create custom detection rules if needed.

Why prioritize this

This vulnerability merits urgent attention due to its high CVSS score, unauthenticated attack vector, and low complexity. Any unpatched GitLab instance on a network accessible to potential attackers is at immediate risk of service disruption. The lack of KEV status does not diminish priority—early patching reduces exposure before public exploit code emerges or active campaigns materialize. Organizations should treat this as a critical patch cycle item.

Risk score, explained

The CVSS 3.1 score of 7.5 (HIGH) reflects the combination of a network-accessible attack vector, no authentication requirement, low attack complexity, and high impact to availability. While confidentiality and integrity are not compromised, the availability impact is rated high because the vulnerability allows complete service disruption. The score does not account for business context or exploit prevalence, which may warrant elevated priority in your environment.

Frequently asked questions