CVE-2021-39935: GitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF) Vulnerability

High severity, CVSS 7.5. Actively exploited: in CISA KEV since 2026-02-03. EPSS: 36.1% chance of exploitation in the next 30 days.

An issue has been discovered in GitLab CE/EE affecting all versions starting from 10.5 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2. Unauthorized external users could perform Server Side Requests via the CI Lint API

Affected products

• GitLab GitLab: from 10.5.0, before 14.3.6 (fixed in 14.3.6); from 14.4.0, before 14.4.4 (fixed in 14.4.4); from 14.5.0, before 14.5.2 (fixed in 14.5.2)

Published 2021-12-13. Last modified 2026-06-17.