id: PYSEC-2026-2510
published: "2026-07-13T15:46:20.346348Z"
modified: "2026-07-13T16:04:16.547323Z"
aliases:
- CVE-2026-53869
- GHSA-4pqm-j46f-795x
summary: 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.
affected:
- package:
    name: hermes-agent
    ecosystem: PyPI
    purl: pkg:pypi/hermes-agent
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: "0"
    - fixed: 0.16.0
  versions:
  - 0.13.0
  - 0.14.0
  - 0.15.0
  - 0.15.1
  - 0.15.2
references:
- type: ADVISORY
  url: https://nvd.nist.gov/vuln/detail/CVE-2026-53869
- type: WEB
  url: https://github.com/NousResearch/hermes-agent/pull/30221
- type: WEB
  url: https://github.com/NousResearch/hermes-agent/pull/31685
- type: WEB
  url: https://github.com/NousResearch/hermes-agent/commit/d9ec90585cf7616b5972e44cf8d92bb569fc3feb
- type: PACKAGE
  url: https://github.com/NousResearch/hermes-agent
- type: WEB
  url: https://github.com/NousResearch/hermes-agent/releases/tag/v2026.6.5
- type: WEB
  url: https://www.vulncheck.com/advisories/hermes-agent-dns-rebinding-bypass-via-websocket-endpoints
- type: PACKAGE
  url: https://pypi.org/project/hermes-agent
- type: ADVISORY
  url: https://github.com/advisories/GHSA-4pqm-j46f-795x
severity:
- type: CVSS_V3
  score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- type: CVSS_V4
  score: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N