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CVE-2026-90970 is a template-engine neutralization vulnerability in GitLab AI Gateway's handling of Duo Agent Platform custom-flow prompt templates. Under unspecified conditions, an authenticated user with Duo Agent Platform access can submit a specially crafted flow configuration that escapes the prompt-template sandbox and potentially executes arbitrary commands on the gateway. Affected versions are 18.1.6 through versions before 19.2.4, the 19.3 release line before 19.3.2, and the 19.4 release line before 19.4.1. The precise exploit configuration and underlying template engine have not been disclosed.
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A critical custom-flow template sandbox escape in GitLab AI Gateway, rated CVSS 9.9. Exploitation requires authentication and access to Duo Agent Platform; additional necessary conditions are unspecified. Affected Gateway versions are 18.1.6 through versions before 19.2.4, 19.3 before 19.3.2, and 19.4 before 19.4.1. Fixes are available in 19.2.4, 19.3.2, and 19.4.1. GitLab-hosted gateways have already been updated; organizations operating their own gateways must update them. The advisory does not disclose exploitation status, while CISA's October 2 assessment lists exploitation as 'none'. No temporary workaround or method for checking prior compromise is provided.
A critical improper neutralization vulnerability in GitLab's AI Gateway allows authenticated attackers with basic privileges and Duo Agent Platform access to escape the prompt template sandbox and execute arbitrary commands. GitLab released versions 19.2.4, 19.3.2, and 19.4.1 to fix affected self-hosted deployments and urges immediate patching. Cloud-hosted AI Gateway customers are already protected.
A critical template injection and sandbox escape vulnerability in GitLab AI Gateway custom-flow functionality. An authenticated attacker with access to the affected Duo Agent Platform functionality can submit a crafted flow configuration to execute arbitrary commands on the gateway host without additional user interaction. Reported affected versions are 18.1.6–19.2.3, 19.3.0–19.3.1, and 19.4.0. The article emphasizes self-hosted deployments and reports no confirmed active exploitation or CISA KEV listing.
A critical template-engine sandbox escape in GitLab AI Gateway, reported with a CVSS v4.0 score of 9.9. An authenticated user with GitLab Duo Agent Platform access can submit a crafted flow configuration, bypass sanitization, and execute arbitrary commands as the gateway service. Potential consequences include source-code interception, credential theft, session hijacking, and access to internal LLM endpoints. Reported affected gateway versions are 18.1.6–19.2.3, 19.3.0–19.3.1, and 19.4.0. GitLab-hosted gateways have been patched; self-hosted deployments require administrator updates. The article identifies self-hosted-v19.4.1-ee as an example patched image and says branches 19.1 and earlier must move to a supported minor release.
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