CVE-2026-10224Public exploitNetwork attack vector

Webhook denial via pre-authentication quota charging

Published Jun 1, 2026 · Updated Jun 1, 2026

Uncontrolled resource consumption in Nous Research Hermes Agent 2026.4.0 through 2026.4.30 allows remote attackers to block Feishu webhooks. The _handle_webhook_request handler charges invalid requests to a shared per-source delivery bucket before checking the verification token or signature. Repeated malformed requests to a reachable webhook exhaust that bucket, causing later legitimate signed callbacks from the same source bucket to receive HTTP 429 responses.

CVSS severity5.3
Medium
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in Nous Research Hermes Agent 2026.4.0 through 2026.4.30 allows remote attackers to block Feishu webhooks. The _handle_webhook_request handler charges invalid requests to a shared per-source delivery bucket before checking the verification token or signature. Repeated malformed requests to a reachable webhook exhaust that bucket, causing later legitimate signed callbacks from the same source bucket to receive HTTP 429 responses.

The record

CVE
CVE-2026-10224
Published
Jun 1, 2026
Updated
Jun 1, 2026
Vendor
Nous Research
Product
Hermes Agent
Classifications
CWE-400, CWE-404, T1499.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 1, 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=2026.4.17
  11. Affected versionversion=2026.4.18
  12. Affected versionversion=2026.4.19
  13. Affected versionversion=2026.4.2
  14. Affected versionversion=2026.4.20
  15. Affected versionversion=2026.4.21
  16. Affected versionversion=2026.4.22
  17. Affected versionversion=2026.4.23
  18. Affected versionversion=2026.4.24
  19. Affected versionversion=2026.4.25
  20. Affected versionversion=2026.4.26
  21. Affected versionversion=2026.4.27
  22. Affected versionversion=2026.4.28
  23. Affected versionversion=2026.4.29
  24. Affected versionversion=2026.4.3
  25. Affected versionversion=2026.4.30
  26. Affected versionversion=2026.4.4
  27. Affected versionversion=2026.4.5
  28. Affected versionversion=2026.4.6
  29. Affected versionversion=2026.4.7
  30. Affected versionversion=2026.4.8
  31. 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=2026.4.17; version=2026.4.18; version=2026.4.19; version=2026.4.2; version=2026.4.20; version=2026.4.21; version=2026.4.22; version=2026.4.23; version=2026.4.24; version=2026.4.25; version=2026.4.26; version=2026.4.27; version=2026.4.28; version=2026.4.29; version=2026.4.3; version=2026.4.30; 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

5.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.0VulDBAV:N/AC:L/Au:N/C:N/I:N/A:P
5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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-400Uncontrolled Resource Consumption
CWE-404Improper Resource Shutdown or Release
T1499.002Service Exhaustion Flood

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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