CVE-2026-90970: GitLab Ai Gateway

Critical severity, CVSS 9.9. EPSS: 0.9% 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 18.1.6 before 19.2.4, 19.3 before 19.3.2, and 19.4 before 19.4.1 that, under certain conditions, could have allowed an authenticated user with Duo Agent Platform access to escape the prompt template sandbox via a specially crafted flow configuration, resulting in arbitrary command execution on the AI Gateway.

Affected products

• GitLab GitLab Ai Gateway: from 18.1.6, before 19.2.4 (fixed in 19.2.4); from 19.3, before 19.3.2 (fixed in 19.3.2); from 19.4, before 19.4.1 (fixed in 19.4.1)

Published 2026-10-02. Last modified 2026-10-02.