HIGH7.5
PYSEC-2026-2510
Hermes Agent contains a DNS rebinding vulnerability in WebSocket endpoints that allows remote attackers to bypass Host and Origin validation
Quick fix
PYSEC-2026-2510 — hermes-agent: upgrade to the fixed version with the command below.
pip install --upgrade 'hermes-agent>=0.16.0'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.
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-53869[ADVISORY]
- https://github.com/NousResearch/hermes-agent/pull/30221[WEB]
- https://github.com/NousResearch/hermes-agent/pull/31685[WEB]
- https://github.com/NousResearch/hermes-agent/commit/d9ec90585cf7616b5972e44cf8d92bb569fc3feb[WEB]
- https://github.com/NousResearch/hermes-agent[PACKAGE]
- https://github.com/NousResearch/hermes-agent/releases/tag/v2026.6.5[WEB]
- https://www.vulncheck.com/advisories/hermes-agent-dns-rebinding-bypass-via-websocket-endpoints[WEB]
- https://pypi.org/project/hermes-agent[PACKAGE]
- https://github.com/advisories/GHSA-4pqm-j46f-795x[ADVISORY]