Critical Sandbox Bypass Flaw in GitLab AI Gateway Enables Remote Command Execution

GitLab has released patches for a critical vulnerability in its GitLab AI Gateway component that allows authenticated users to bypass sandbox restrictions and execute arbitrary commands. The flaw, tracked as CVE-2026-90970, resides in the custom flow prompt template processing of the Duo Agent Platform and carries a CVSS v3.1 base score of 9.9. Self-hosted deployments are affected, while GitLab’s own hosted AI Gateway service has already been updated. The company urges immediate upgrades to versions 19.4.1, 19.3.2, or 19.2.4. The vulnerability can be triggered under specific conditions by users with access to the Duo Agent Platform through crafted flow configurations.

Security NEXTTranslated from Japanese

Read at source

GitLab has issued an urgent security update after a critical vulnerability was discovered in the GitLab AI Gateway. The flaw, identified as CVE-2026-90970, allows authenticated users to bypass sandbox protections and execute arbitrary commands on affected systems.

The issue exists in the prompt template processing logic used by custom flows within the Duo Agent Platform. Under certain conditions, an attacker with valid access can submit a specially crafted flow configuration that escapes the sandbox environment and runs operating system commands.

According to the advisory, the vulnerability received a CVSS v3.1 base score of 9.9 and is rated Critical. GitLab has published fixed releases for self-hosted environments: GitLab AI Gateway 19.4.1, 19.3.2, and 19.2.4. The company states that its own hosted AI Gateway service has already been patched.

Administrators of self-hosted GitLab instances are strongly advised to apply the updates without delay to prevent potential exploitation.

Meridian digestThe week's most consequential security stories, distilled into one briefing.See the digest

More in Vulnerabilities & Exploits

Telegram for Android Patches Voice Call Vulnerability Enabling Code Execution
Yandex Patches Millions of Stations After eMudhra Certificate Keys Compromised
Cisco ASA and FTD Face DoS Vulnerability in SSL VPN Already Exploited in the Wild