CVE-2026-3988: GitLab

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.5 before 18.8.7, 18.9 before 18.9.3, and 18.10 before 18.10.1 that could have allowed an unauthenticated user to cause a denial of service by making the GitLab instance unresponsive due to improper input validation in GraphQL request processing.

Affected products

• GitLab GitLab: from 18.5.0, before 18.8.7 (fixed in 18.8.7); from 18.9.0, before 18.9.3 (fixed in 18.9.3); version 18.10.0 only

Published 2026-03-25. Last modified 2026-06-17.