GitLab has released urgent security updates for a critical AI Gateway vulnerability that could allow authenticated attackers to execute commands remotely. Tracked as CVE-2026-90970, the flaw carries a CVSS score of 9.9 and affects self-hosted deployments used to support GitLab Duo AI features. The company released AI Gateway versions 19.2.4, 19.3.2, and 19.4.1 to address the issue. GitLab strongly recommends that customers running affected self-hosted gateways upgrade immediately. It also contacted self-hosted AI Gateway customers before publishing its security advisory to provide early guidance on the required updates. GitLab AI Gateway Vulnerability The vulnerability involves improper handling of custom flow prompt templates....
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