CVE-2026-9353

HIGH

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

Title source: cna

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.

References (4)

Core 4

Core References

Vdb Entry, Technical Description vdb-entry technical-description

VDB-365316 | NousResearch hermes-agent Skills Guard Multi-Word Prompt skills_guard.py injection

https://vuldb.com/vuln/365316

Signature, Permissions Required signature permissions-required

VDB-365316 | CTI Indicators (IOB, IOC, TTP, IOA)

https://vuldb.com/vuln/365316/cti

Third Party Advisory third-party-advisory

Submit #812216 | NousResearch hermes-agent 2026.4.23 Injection (CWE-74)

https://vuldb.com/submit/812216

Exploit exploit

https://gist.github.com/YLChen-007/82a3539d6358842e69dfaef0a9fcf14a

Scores

CVSS v3 7.3

EPSS 0.0039

EPSS Percentile 30.4%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CISA SSVC

Vulnrichment

Exploitation poc

Automatable yes

Technical Impact partial

Details

CWE

CWE-707 CWE-74

Status published

Products (24)

NousResearch/hermes-agent 2026.4.0

NousResearch/hermes-agent 2026.4.1

NousResearch/hermes-agent 2026.4.10

NousResearch/hermes-agent 2026.4.11

NousResearch/hermes-agent 2026.4.12

NousResearch/hermes-agent 2026.4.13

NousResearch/hermes-agent 2026.4.14

NousResearch/hermes-agent 2026.4.15

NousResearch/hermes-agent 2026.4.16

NousResearch/hermes-agent 2026.4.17

... and 14 more

Published May 24, 2026

Tracked Since May 24, 2026