What is CVE-2026-90970?

CVE-2026-90970 is a critical-severity vulnerability in GitLab Ai Gateway, classified under Improper Neutralization of Special Elements Used in a Template Engine. CVSS score: 9.9/10. Published 2026-10-02.

How severe is CVE-2026-90970?

Critical severity. CVSS v3 base score is 9.9 out of 10.

Is CVE-2026-90970 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in GitLab Ai Gateway

CVE-2026-90970

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.

Published 2026-10-02 · last modified 2026-10-02.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

GitLab Ai Gateway

Weakness classification (CWE)

CWE-1336 — Improper Neutralization of Special Elements Used in a Template Engine

Public proof-of-concept exploits

techupdate24/gitlab-ai-gateway-cve-2026-90970

References

gitlab.com/gitlab-org/gitlab/-/work_items/628842

Frequently asked questions

What is CVE-2026-90970?: CVE-2026-90970 is a critical-severity vulnerability in GitLab Ai Gateway, classified under Improper Neutralization of Special Elements Used in a Template Engine. CVSS score: 9.9/10. Published 2026-10-02.
How severe is CVE-2026-90970?: Critical severity. CVSS v3 base score is 9.9 out of 10.
Is CVE-2026-90970 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.