CVE-2026-9367Public exploitNetwork attack vector

Remote command execution via approval regex bypass

Published May 24, 2026 · Updated May 24, 2026

OS command injection in Nous Research Hermes Agent allows remote attackers to execute shell commands through terminal_tool. detect_dangerous_command matches raw command text against incomplete regular expressions, so eval with command substitution evades approval before the shell interprets it. Reachability requires an active agent with terminal_tool enabled to process attacker-influenced LLM input; successful exploitation runs code as the Hermes account.

CVSS severity7.3
High
EPSS probability1.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Nous Research Hermes Agent allows remote attackers to execute shell commands through terminal_tool. detect_dangerous_command matches raw command text against incomplete regular expressions, so eval with command substitution evades approval before the shell interprets it. Reachability requires an active agent with terminal_tool enabled to process attacker-influenced LLM input; successful exploitation runs code as the Hermes account.

The record

CVE
CVE-2026-9367
Published
May 24, 2026
Updated
May 24, 2026
Vendor
Nous Research
Product
Hermes Agent
Classifications
CWE-78, CWE-77, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 24, 2026CVE publishedPublication date reported by the CVE source.
  2. May 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5157f5427f19488b31c6fdebbacd15d798ce7f63

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Nous Research · Hermes Agentversion=5157f5427f19488b31c6fdebbacd15d798ce7f63

Published CVSS scores

5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
7.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
7.5VulDBAV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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