CVE-2026-67413Public exploitNetwork attack vectorHinoki check available

Authenticated CPU exhaustion via unbounded LIKE matching

Published Sep 25, 2026 · Updated Sep 25, 2026

Denial of service in RabbitMQ Server's JMS Topic Exchange plugin allows remote authenticated users to consume broker CPU via crafted selectors. The LIKE evaluator converts client-controlled percent and underscore wildcards into overlapping PCRE fragments, then calls re:run/3 without match or recursion limits. Exploitation requires the optional plugin plus permission to bind and publish to an x-jms-topic exchange; repeated routing delays publisher confirms and competes with unrelated broker work.

CVSS severity6.0
Medium
EPSS probability0.42%
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 JMS Topic Exchange plugin allows remote authenticated users to consume broker CPU via crafted selectors. The LIKE evaluator converts client-controlled percent and underscore wildcards into overlapping PCRE fragments, then calls re:run/3 without match or recursion limits. Exploitation requires the optional plugin plus permission to bind and publish to an x-jms-topic exchange; repeated routing delays publisher confirms and competes with unrelated broker work.

The record

CVE
CVE-2026-67413
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
RabbitMQ
Product
RabbitMQ Server
Classifications
CWE-1333, T1499.004
Attack vector
network
Privileges
authenticated

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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=>= 4.0.0, < 4.0.23
  2. Affected versionversion=>= 4.1.0, < 4.1.14
  3. Affected versionversion=>= 4.2.0, < 4.2.9
  4. Affected versionversion=>= 4.3.0, < 4.3.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

RabbitMQ · RabbitMQ Serverversion=>= 4.0.0, < 4.0.23; version=>= 4.1.0, < 4.1.14; version=>= 4.2.0, < 4.2.9; version=>= 4.3.0, < 4.3.3

Published CVSS scores

6.5RabbitMQ GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.0GitHubCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1333Inefficient Regular Expression Complexity
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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