CVE-2026-90970 PUBLISHED

Improper Neutralization of Special Elements Used in a Template Engine in GitLab AI Gateway

Assigner: GitLab
Reserved: 14.09.2026 Published: 02.10.2026 Updated: 02.10.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS Score: 9.9

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	Low	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	GitLab
Product	GitLab AI Gateway
Versions	Default: unaffected affected from 18.1.6 to 19.2.4 (excl.) affected from 19.3 to 19.3.2 (excl.) affected from 19.4 to 19.4.1 (excl.)

Solutions

Upgrade to version 19.2.4, 19.3.2, 19.4.1 or above.

Credits

Thanks [invisiblemeerkat](https://hackerone.com/invisiblemeerkat) for responsibly disclosing this issue finder

References

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

Problem Types

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