How severe is CVE-2026-90970?

CVE-2026-90970 has a CVSS 3.1 base score of 9.9 (CRITICAL). EPSS estimates a 17.5% probability of exploitation in the next 30 days.

CVE-2026-90970: Improper Neutralization of Special Elements Used

Description

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.

Key Findings

as of 2026-11-12

All KEV statistics→

Its current EPSS score (17.5%) is higher than that of 31% of CISA KEV entries.

Severity

CVSS 3.1 · CNA · Base score9.9 CRITICAL

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:HOpen in CVSS calculator

SSVC · CISA-ADP

Exploitationnone

Automatableno

Technical impacttotal

Affected Products

Vendor	Product	Affected versions
GitLab	GitLab GitLab AI Gateway	18.1.6 to <19.2.4 19.3 to <19.3.2 19.4 to <19.4.1

References

1 links

Other references

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

Record Details

Published: 2026-10-02
Last updated: 2026-10-02
Assigner (CNA): GitLab
Credited to: Thanks [invisiblemeerkat](https://hackerone.com/invisiblemeerkat) for responsibly disclosing this issue

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CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). Alert titles and links from CISA cybersecurity alerts. This site is not affiliated with or endorsed by MITRE, NVD, CISA, or FIRST.

CVE-2026-90970