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CVE-2026-90970

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

  • Critical 9.9

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 facts

Published
2 Oct 2026
Last changed
2 Oct 2026
Assigned by
GitLab
EPSS
17.488% likely to be exploited in the next 30 days, higher than 97.181% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: none; Automatable: no; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 9.9CVSS 3.1, Criticalfrom the CNA (GitLab)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

No explicit remediation statement is available on this page yet. Consult the original record and vendor references before choosing a fix.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
GitLabGitLab AI Gateway
  • Default status: unaffected
  • 18.1.6 up to but excluding 19.2.4 (affected)
  • 19.3 up to but excluding 19.3.2 (affected)
  • 19.4 up to but excluding 19.4.1 (affected)

Timeline

  1. 2 Oct 2026 Published

Weakness

References