CVE-2026-9350Public exploitNetwork attack vector

Host command execution via fail-open batch approval

Published May 24, 2026 · Updated May 24, 2026

Missing authorization in Hermes Agent 2026.4.0 through 2026.4.16 allows remote attackers to execute host commands via a crafted JSONL dataset. The Batch Runner leaves approval-context variables unset, so check_all_command_guards returns approved before dangerous-command checks. The attack requires an operator to process attacker-controlled dataset prompts; commands then run with the Hermes Agent process privileges.

CVSS severity7.3
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Hermes Agent 2026.4.0 through 2026.4.16 allows remote attackers to execute host commands via a crafted JSONL dataset. The Batch Runner leaves approval-context variables unset, so check_all_command_guards returns approved before dangerous-command checks. The attack requires an operator to process attacker-controlled dataset prompts; commands then run with the Hermes Agent process privileges.

The record

CVE
CVE-2026-9350
Published
May 24, 2026
Updated
May 24, 2026
Vendor
Nous Research
Product
Hermes Agent
Classifications
CWE-863, CWE-862, T1204.002
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=2026.4.0
  2. Affected versionversion=2026.4.1
  3. Affected versionversion=2026.4.10
  4. Affected versionversion=2026.4.11
  5. Affected versionversion=2026.4.12
  6. Affected versionversion=2026.4.13
  7. Affected versionversion=2026.4.14
  8. Affected versionversion=2026.4.15
  9. Affected versionversion=2026.4.16
  10. Affected versionversion=2026.4.2
  11. Affected versionversion=2026.4.3
  12. Affected versionversion=2026.4.4
  13. Affected versionversion=2026.4.5
  14. Affected versionversion=2026.4.6
  15. Affected versionversion=2026.4.7
  16. Affected versionversion=2026.4.8
  17. Affected versionversion=2026.4.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Nous Research · Hermes Agentversion=2026.4.0; version=2026.4.1; version=2026.4.10; version=2026.4.11; version=2026.4.12; version=2026.4.13; version=2026.4.14; version=2026.4.15; version=2026.4.16; version=2026.4.2; version=2026.4.3; version=2026.4.4; version=2026.4.5; version=2026.4.6; version=2026.4.7; version=2026.4.8; version=2026.4.9

Published CVSS scores

7.5VulDBAV:N/AC:L/Au:N/C:P/I:P/A:P
7.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
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

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
CWE-862Missing Authorization
T1204.002Malicious File

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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