CVE-2026-75871: GitLab

Critical severity, CVSS 9.6. EPSS: 0.3% chance of exploitation in the next 30 days.

GitLab has remediated a vulnerability in the GitLab AI Gateway component affecting all versions of the AI Gateway from 18.10 to 19.0.12, 19.1 to 19.1.7, and 19.2 to 19.2.2 that could have allowed an authenticated user with Duo Agent Platform access to redirect outbound model requests to an externally-controlled endpoint via a crafted inline flow configuration that overrides the HTTP Host header, resulting in disclosure of Google Cloud Vertex cloud service credentials and private signing keys.

Affected products

• GitLab GitLab: from 18.10.0, before 19.0.12 (fixed in 19.0.12); from 19.1.0, before 19.1.7 (fixed in 19.1.7); from 19.2.0, before 19.2.2 (fixed in 19.2.2)

Published 2026-08-27. Last modified 2026-09-01.