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CVE-2026-9353

NousResearch hermes-agent Skills Guard Multi-Word Prompt skills_guard.py injection

Published: May 24, 2026Updated: May 26, 2026 Sources: CVE List NVDCWE-74
NVD MITRE
7.3CVSSHIGH
EPSS Score
0.4%
Top 69.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

Description

A security vulnerability has been detected in NousResearch hermes-agent up to 2026.4.23. Impacted is an unknown function of the file agent/skills_guard.py of the component Skills Guard Multi-Word Prompt Handler. The manipulation of the argument THREAT_PATTERNS leads to injection. Remote exploitation of the attack is possible. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:LA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:LAvailability
Low
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Weaknesses

CWE-74CWE-707

Affected Products

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

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

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

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://gist.github.com/YLChen-007/82a3539d6358842e69dfaef0a9fcf14a
gist.github.com
https://vuldb.com/submit/812216
vuldb.com
https://vuldb.com/vuln/365316
vuldb.com
and 1 more references View all →

Timeline

Published
May 24, 2026
Last Updated
May 26, 2026

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