Vulnerability Description
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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/NousResearch/hermes-agent/commit/d9ec90585cf7616b5972e44cf8d9
- https://github.com/NousResearch/hermes-agent/pull/30221
- https://github.com/NousResearch/hermes-agent/pull/31685
- https://github.com/NousResearch/hermes-agent/releases/tag/v2026.6.5
- https://www.vulncheck.com/advisories/hermes-agent-dns-rebinding-bypass-via-webso
FAQ
What is CVE-2026-53869?
CVE-2026-53869 is a vulnerability with a CVSS score of 7.5 (HIGH). 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...
How severe is CVE-2026-53869?
CVE-2026-53869 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-53869?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.