GitLab AI Gateway up to 18.6.1/18.7.0/18.8.0 Duo Workflow Service special elements used in a template engine

Summaryinfo

A vulnerability was found in GitLab AI Gateway up to 18.6.1/18.7.0/18.8.0 and classified as critical. This issue affects some unknown processing of the component Duo Workflow Service. The manipulation results in improper neutralization of special elements used in a template engine. This vulnerability is cataloged as CVE-2026-1868. The attack may be launched remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in GitLab AI Gateway up to 18.6.1/18.7.0/18.8.0. Affected is an unknown code of the component Duo Workflow Service. The manipulation with an unknown input leads to a improper neutralization of special elements used in a template engine vulnerability. CWE is classifying the issue as CWE-1336. The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

GitLab has remediated a vulnerability in the Duo Workflow Service component of GitLab AI Gateway affecting all versions of the AI Gateway from 18.1.6, 18.2.6, 18.3.1 to 18.6.1, 18.7.0, and 18.8.0 in which AI Gateway was vulnerable to insecure template expansion of user supplied data via crafted Duo Agent Platform Flow definitions. This vulnerability could be used to cause Denial of Service or gain code execution on the Gateway. This has been fixed in versions 18.6.2, 18.7.1, and 18.8.1 of the GitLab AI Gateway.

The advisory is shared for download at gitlab.com. This vulnerability is traded as CVE-2026-1868 since 02/03/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1221.

Upgrading to version 18.6.2, 18.7.1 or 18.8.1 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Bug Tracking Software

Vendor

• GitLab

Name

• AI Gateway

Version

• 18.0
• 18.1
• 18.2
• 18.3
• 18.4
• 18.5
• 18.6
• 18.6.0
• 18.6.1
• 18.7
• 18.7.0
• 18.8.0

License

• open-source

Website

• Vendor: https://gitlab.com/

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