CVE-2025-12983: GitLab

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.9 before 18.3.6, 18.4 before 18.4.4, and 18.5 before 18.5.2 that could have allowed an authenticated attacker to cause a denial of service condition by submitting specially crafted markdown content with nested formatting patterns.

Affected products

• GitLab GitLab: from 16.9.0, before 18.3.6 (fixed in 18.3.6); from 18.4.0, before 18.4.4 (fixed in 18.4.4); from 18.5.0, before 18.5.2 (fixed in 18.5.2)

Published 2025-11-15. Last modified 2026-06-17.