---
id: CVE-2026-53869
title: >-
  Hermes Agent contains a DNS rebinding vulnerability in WebSocket endpoints
  that allows remote attackers to bypass Host and Origin validation
summary: >-
  Hermes Agent contains a DNS rebinding vulnerability in WebSocket endpoints
  that allows remote attackers to bypass Host and Origin validation
severity: high
cvss: 7.5
cwe:
  - CWE-306
vendor: hermes-agent
product: hermes-agent
ecosystem: pip
affected:
  - hermes-agent < 0.16.0
patched:
  - hermes-agent 0.16.0
published: '2026-06-17'
updated: '2026-06-19'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-4pqm-j46f-795x'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53869'
  - url: 'https://github.com/NousResearch/hermes-agent/pull/30221'
  - url: 'https://github.com/NousResearch/hermes-agent/pull/31685'
  - url: >-
      https://github.com/NousResearch/hermes-agent/commit/d9ec90585cf7616b5972e44cf8d92bb569fc3feb
  - url: 'https://github.com/NousResearch/hermes-agent/releases/tag/v2026.6.5'
  - url: >-
      https://www.vulncheck.com/advisories/hermes-agent-dns-rebinding-bypass-via-websocket-endpoints
  - url: 'https://github.com/advisories/GHSA-4pqm-j46f-795x'
tags:
  - ghsa
  - pip
epss: 0.00592
epssPercentile: 0.47037
ingestedAt: '2026-06-29T14:31:47.160Z'
---

## Overview

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 packages

- `hermes-agent < 0.16.0`

## Remediation

Upgrade to a patched release:

- `hermes-agent 0.16.0`