GitHub Advisoryadvisory · PyPI

GHSA-4pqm-j46f-795x Hermes Agent contains a DNS rebinding vulnerability in WebSocket endpoints that allows remote attackers to bypass Host and Origin validation

HIGH Published 2026-06-17 Modified 2026-06-19 Official page ↗
Aliases
CVE-2026-53869
Ecosystem
PyPI
Packages
hermes-agent
Severity
High
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-306
Reviewed
2026-06-19

Affected packages

• PyPI hermes-agent: < 0.16.0 → fixed in 0.16.0

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.

Related

Alias · CVE (1)

  • CVE-2026-53869 Hermes Agent before 0.16.0 contains a DNS rebinding vulnerability in WebSocket endpoints that allows remote attackers to bypass Host and… vulnerability

Weakness · CWE (1)

  • CWE-306 Missing Authentication for Critical Functionality weakness

References