EUVD-2026-91651
GHSA-5295-vp56-jghq
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Network-reachable gateway (AV:N), authenticated Duo Agent user (PR:L), no interaction (UI:N); sandbox escape crosses a trust boundary (S:C) yielding full command execution (C/I/A:H).
Primary rating from Vendor (GitLab).
CVSS VectorVendor: GitLab
Lifecycle Timeline
3DescriptionCVE.org
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.
Articles & Coverage 1
AnalysisAI
Remote command execution on the GitLab AI Gateway is achievable by an authenticated user who has been granted Duo Agent Platform access, by supplying a specially crafted flow configuration whose prompt template escapes the intended sandbox (CVE-2026-90970). The flaw is a server-side template injection (CWE-1336) rated CVSS 9.9 (AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H), meaning a single low-privileged authenticated account yields high confidentiality, integrity, and availability impact that extends beyond the vulnerable component's own security scope. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated GitLab user who has been granted Duo Agent Platform access (PR:L), and the attacker must be able to supply a specially crafted flow configuration whose prompt template escapes the sandbox. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority vulnerability, not a high-CVSS-but-low-real-risk case. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade the GitLab AI Gateway to 19.2.4, 19.3.2, or 19.4.1 (depending on your release train), per the advisory at https://gitlab.com/gitlab-org/gitlab/-/work_items/628842; applying the fixed build is the only complete remediation because the defect is in the template rendering logic itself and cannot be fully closed by configuration. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all GitLab AI Gateway deployments and determine which fall in the affected ranges: 18.1.6 up to but not including 19.2.4, 19.3 before 19.3.2, and 19.4 before 19.4.1; confirm whether Duo Agent Platform is enabled, and if it is not required for business operations, disable it immediately to remove the attack path; restrict Duo Agent Platform access to the smallest possible set of trusted accounts and review the current entitlement list for stale or overly broad grants. …
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External POC / Exploit Code
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