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CVE-2026-9354— NousResearch hermes-agent Slack Agent/Mattermost Agent escape output

CVSS 6.5 · Medium EPSS 0.04% · P14

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 17

VendorProductVersion RangeStatus
NousResearchhermes-agent2026.4.0affected
2026.4.1affected
2026.4.2affected
2026.4.3affected
2026.4.4affected
2026.4.5affected
2026.4.6affected
2026.4.7affected
… +9 more rows
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I. Basic Information for CVE-2026-9354

Vulnerability Information
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Vulnerability Title
NousResearch hermes-agent Slack Agent/Mattermost Agent escape output
Source: NVD (National Vulnerability Database)
Vulnerability Description
A vulnerability was detected in NousResearch hermes-agent up to 2026.4.16. The affected element is an unknown function of the component Slack Agent/Mattermost Agent. The manipulation of the argument format_message results in escaping of output. The attack can be executed remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
对输出编码和转义不恰当
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
NousResearchhermes-agent 2026.4.0 cpe:2.3:a:nousresearch:hermes-agent:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-9354

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III. Intelligence Information for CVE-2026-9354

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Proof of Concept for CVE-2026-9354 (1)

Same Patch Batch · NousResearch · 2026-05-24 · 9 CVEs total

CVE-2026-93507.3 HIGHNousResearch hermes-agent Batch Runner approval.py check_all_command_guards authorization
CVE-2026-93537.3 HIGHNousResearch hermes-agent Skills Guard Multi-Word Prompt skills_guard.py injection
CVE-2026-93667.3 HIGHNousResearch hermes-agent prompt_builder.py _scan_context_content injection
CVE-2026-93687.3 HIGHNousResearch hermes-agent Environment Variable code_execution_tool.py execute_code sandbox
CVE-2026-93677.3 HIGHNousResearch hermes-agent terminal_tool approval.py detect_dangerous_command os command in
CVE-2026-93516.5 MEDIUMNousResearch hermes-agent read_file Tool file_tools.py _is_blocked_device path traversal
CVE-2026-93525.3 MEDIUMNousResearch hermes-agent Messaging Gateway local.py _make_run_env information disclosure
CVE-2026-93695.3 MEDIUMNousResearch hermes-agent CLI web-dashboard web_server.py _discover_dashboard_plugins comp

IV. Related Vulnerabilities

Same product: hermes-agent
Same vendor: NousResearch
Same weakness: CWE-116

V. Comments for CVE-2026-9354

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