HIGH 7.5
GHSA-4pqm-j46f-795x
Hermes Agent contains a DNS rebinding vulnerability in WebSocket endpoints that allows remote attackers to bypass Host and Origin validation
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.
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Affected packages
PyPI / hermes-agent
Introduced in:
0 Fixed in: 0.16.0 Fix
pip install --upgrade 'hermes-agent>=0.16.0' 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]