CVE-2026-53869

HIGH8.7

Hermes Agent < 0.16.0 - DNS Rebinding Bypass via WebSocket Endpoints

Published Jun 17, 2026

Modified 2 weeks ago

Details

Hermes Agent before 0.16.0 contains a DNS rebinding vulnerability in WebSocket endpoints that allows remote attackers to bypass Host and Origin validation. FastAPI HTTP middleware does not execute for WebSocket upgrade requests on /api/pty, /api/ws, /api/pub, and /api/events endpoints, enabling attackers to exploit DNS rebinding and inject malicious commands or read terminal output.

References

FIX

https://github.com/NousResearch/hermes-agent/commit/d9ec90585cf7616b5972e44cf8d92bb569fc3feb

WEB

https://github.com/NousResearch/hermes-agent/pull/30221

WEB

https://github.com/NousResearch/hermes-agent/pull/31685

WEB

https://github.com/NousResearch/hermes-agent/releases/tag/v2026.6.5

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-53869

ADVISORY