CVE-2026-53869CWE-306

CVE-2026-53869

High · published June 17, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
56.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00812 · 56.6th percentile
Weakness
CWE-306 · Missing Authentication for Critical Function
Published
2026-06-17T23:18Z
References (5)
https://github.com/NousResearch/hermes-agent/commit/d9ec90585cf7616b5972e44cf8d92bb569fc3feb · [email protected]https://github.com/NousResearch/hermes-agent/pull/30221 · [email protected]https://github.com/NousResearch/hermes-agent/pull/31685 · [email protected]https://github.com/NousResearch/hermes-agent/releases/tag/v2026.6.5 · [email protected]https://www.vulncheck.com/advisories/hermes-agent-dns-rebinding-bypass-via-websocket-endpoints · [email protected]
EPSS history
Timeline
  • 17 JUN 17:57Z
    Hermes Agent < 0.16.0 - DNS Rebinding Bypass via WebSocket Endpoints
    cvelistv5