Hermes Agent contains a DNS rebinding vulnerability in WebSocket endpoints that allows remote attackers to bypass Host and Origin validation
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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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-53869US | —OT elevated | — | ||
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… | ||||
02
references
External citations — patches, advisories, analysis.
- https://github.com/NousResearch/hermes-agentPACKAGE
- https://github.com/NousResearch/hermes-agent/commit/d9ec90585cf7616b5972e44cf8d92bb569fc3febWEB
- https://github.com/NousResearch/hermes-agent/pull/30221WEB
- https://github.com/NousResearch/hermes-agent/pull/31685WEB
- https://github.com/NousResearch/hermes-agent/releases/tag/v2026.6.5WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-53869ADVISORY
- https://www.vulncheck.com/advisories/hermes-agent-dns-rebinding-bypass-via-websocket-endpointsWEB
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