CVE-2026-53869
CVE-2026-53869 · Hermes Agent < 0.16.0 - DNS Rebinding Bypass via WebSocket Endpoints
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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 8.7 · High · EPSS 0.6% · Fix available
- Published
- Updated
Stack: python
Affected products and versions
hermes-agent
- Versions
- ≥ 0, < 0.16.0: Affected (semver)
- 0.16.0: Not affected (semver)
Update to 0.16.0
hermes-agent PyPI
- Versions
- 0.13.0
- 0.14.0
- 0.15.0
- 0.15.1
- 0.15.2
- Affected ranges
- ECOSYSTEM: < 0.16.0
Update to 0.16.0
Original sources
- https://github.com/NousResearch/hermes-agent/releases/tag/v2026.6.5
- https://github.com/NousResearch/hermes-agent/pull/30221
- https://github.com/NousResearch/hermes-agent/pull/31685
- https://github.com/NousResearch/hermes-agent/commit/d9ec90585cf7616b5972e44cf8d92bb569fc3feb
- https://www.vulncheck.com/advisories/hermes-agent-dns-rebinding-bypass-via-websocket-endpoints
- https://nvd.nist.gov/vuln/detail/CVE-2026-53869