CVE-2025-2256: GitLab

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

An issue has been discovered in GitLab CE/EE affecting all versions from 7.12 before 18.1.6, 18.2 before 18.2.6, and 18.3 before 18.3.2 that could have allowed unauthorized users to render the GitLab instance unresponsive to legitimate users by sending multiple concurrent large SAML responses.

Affected products

• GitLab GitLab: from 7.12.0, before 18.1.6 (fixed in 18.1.6); from 18.2.0, before 18.2.6 (fixed in 18.2.6); from 18.3.0, before 18.3.2 (fixed in 18.3.2)

Published 2025-09-12. Last modified 2026-06-17.