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CVE-2026-53869— Hermes Agent < 0.16.0 - DNS Rebinding Bypass via WebSocket Endpoints

Quick assessment

Affected
NousResearch hermes-agent
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

nousresearch hermes-agent是nousresearch的人工智能代理框架。 nousresearch hermes-agent 0.16.0之前版本存在安全漏洞，该漏洞源于WebSocket端点存在的DNS重绑定漏洞，导致远程攻击者绕过Host和Origin验证，FastAPI HTTP中间件未对/api/pty、/api/ws、/api/pub和/api/events终端的WebSocket升级请求执行验证，使得攻击者能够利用DNS重绑定注入恶意命令或读取终端输出。

CVSS 7.5 · High EPSS 0.81% · P56

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
NousResearch hermes-agent < 0.16.0 affected
0.16.0 unaffected
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I. Basic Information for CVE-2026-53869

Vulnerability Information
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Vulnerability Title
Hermes Agent < 0.16.0 - DNS Rebinding Bypass via WebSocket Endpoints
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
nousresearch hermes-agent 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
nousresearch hermes-agent是nousresearch的人工智能代理框架。 nousresearch hermes-agent 0.16.0之前版本存在安全漏洞，该漏洞源于WebSocket端点存在的DNS重绑定漏洞，导致远程攻击者绕过Host和Origin验证，FastAPI HTTP中间件未对/api/pty、/api/ws、/api/pub和/api/events终端的WebSocket升级请求执行验证，使得攻击者能够利用DNS重绑定注入恶意命令或读取终端输出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
NousResearch hermes-agent 0 ~ 0.16.0 -

II. Public POCs for CVE-2026-53869

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7459 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-53869

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Patches & Fixes for CVE-2026-53869 (3)

Vendor Advisories for CVE-2026-53869 (1)

Vendor Pages for CVE-2026-53869 (1)

IV. Related Vulnerabilities

Same product: hermes-agent
Same vendor: NousResearch
Same weakness: CWE-306

V. Comments for CVE-2026-53869

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