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CVE-2026-53869

Hermes Agent < 0.16.0 - DNS Rebinding Bypass via WebSocket Endpoints

Published: Jun 17, 2026Updated: Jun 18, 2026 Sources: CVE List NVDCWE-306
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.6%
Top 56.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-306

Affected Products

hermes-agentNousResearch
Mixed
AI / ML / ai-agent-tooling
nousresearchcommercialAI / MLaka nousresearch, hermes-agent

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

https://github.com/NousResearch/hermes-agent/releases/tag/v2026.6.5
github.com
https://github.com/NousResearch/hermes-agent/pull/30221
github.com
https://github.com/NousResearch/hermes-agent/pull/31685
github.com
and 2 more references View all →

Timeline

Published
Jun 17, 2026
Last Updated
Jun 18, 2026

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