CVE-2026-67230Network attack vectorHinoki check available

Denial of service via unbounded pre-authentication state

Published Sep 25, 2026 · Updated Sep 25, 2026

Denial of service in RabbitMQ Server's Web-STOMP handler allows remote attackers to exhaust memory through unauthenticated connections. The handler applies neither max_frame_size nor login_timeout before authentication, so a slow stream of small WebSocket frames retains unbounded state. The rabbitmq_web_stomp plugin must be enabled; sustained connections can exhaust broker memory and interrupt messaging.

CVSS severity6.3
Medium
EPSS probability0.47%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Denial of service in RabbitMQ Server's Web-STOMP handler allows remote attackers to exhaust memory through unauthenticated connections. The handler applies neither max_frame_size nor login_timeout before authentication, so a slow stream of small WebSocket frames retains unbounded state. The rabbitmq_web_stomp plugin must be enabled; sustained connections can exhaust broker memory and interrupt messaging.

The record

CVE
CVE-2026-67230
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
RabbitMQ
Product
RabbitMQ Server
Classifications
CWE-770, T1499.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 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=>= 3.13.0, < 3.13.15
  2. Affected versionversion=>= 4.0.0, < 4.0.20
  3. Affected versionversion=>= 4.1.0, < 4.1.11
  4. Affected versionversion=>= 4.2.0, < 4.2.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

RabbitMQ · RabbitMQ Serverversion=>= 3.13.0, < 3.13.15; version=>= 4.0.0, < 4.0.20; version=>= 4.1.0, < 4.1.11; version=>= 4.2.0, < 4.2.6

Published CVSS scores

6.3RabbitMQCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.002Service Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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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