CVE-2026-53869
Hermes Agent < 0.16.0 - DNS Rebinding Bypass via WebSocket Endpoints
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.
INFO
Published Date :
June 17, 2026, 5:57 p.m.
Last Modified :
June 17, 2026, 5:57 p.m.
Remotely Exploit :
Yes !
Source :
VulnCheck
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 |
Solution
- Update Hermes Agent to version 0.16.0 or later.
- Review HTTP middleware configuration for WebSocket endpoints.
- Implement Host and Origin validation for WebSocket requests.
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