CVE-2026-67179: Genkit improper host header validation

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-11 · updated 2026-10-24
Weakness: CWE-644

Description

Genkit does not properly validate host request headers. Any host on the developer's network, and any website the developer visits (via DNS rebinding), can reach POST /api/runAction on the Dev UI server (default port 4000) and execute any registered Genkit action and read the result. Fixed on 2026-06-18.

Affected products

genkit-ai genkit: before 2026-06-18 — fixed in 2026-06-18

How to fix

Upgrade to a fixed version: genkit-ai genkit 2026-06-18. Check the vendor advisory for mitigations.

References

https://github.com/genkit-ai/genkit/issues/5581
https://github.com/genkit-ai/genkit/pull/5587
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-223-01.json
https://www.cve.org/CVERecord?id=CVE-2026-67179

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