RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.19, 4.0.24, 4.1.15, 4.2.10, and 4.3.5, the MQTT 5 parser in deps/rabbitmq_mqtt/src/rabbit_mqtt_packet.erl accepts Request-Problem-Information on PUBLISH packets even though the property is valid only for CONNECT. An authenticated publisher with topic write permission can cause the broker to store and route that inapplicable property to a separately authenticated matching subscriber. When the subscriber path serializes the outbound PUBLISH, serialise_prop/2 has no matching clause, and the uncontained function_clause exception closes the victim MQTT or Web MQTT connection. The publisher connection and broker remain available, and queued replay, retained-message persistence, and broker-wide denial of service were not established. This issue is fixed in versions 3.13.19, 4.0.24, 4.1.15, 4.2.10, and 4.3.5.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.004.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
rabbitmq rabbitmq-server affected
Version Status Constraints
>= 3.13.0, < 3.13.19 affected —
>= 4.0.0, < 4.0.24 affected —
>= 4.1.0, < 4.1.15 affected —
>= 4.2.0, < 4.2.10 affected —
>= 4.3.0, < 4.3.5 affected —

No data.

No data.

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Vendors Products
Rabbitmq Subscribe
Rabbitmq-server Subscribe

Project Subscriptions

Vendors Products
Rabbitmq Subscribe
Rabbitmq-server Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/rabbitmq/rabbitmq-server/commit/4639a4318c72a0660e4bc014767fad70ce288fbc cve-icon cve-icon cve-icon
https://github.com/rabbitmq/rabbitmq-server/commit/908f944a1d581d10774f8d6d0dcf2a1a713779fb cve-icon cve-icon cve-icon
https://github.com/rabbitmq/rabbitmq-server/pull/17035 cve-icon cve-icon cve-icon
https://github.com/rabbitmq/rabbitmq-server/pull/17287 cve-icon cve-icon cve-icon
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.5 cve-icon cve-icon cve-icon
https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-jv99-v328-mvmm cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-67418 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-67418 cve-icon
History

Sat, 17 Oct 2026 19:45:00 +0000

Type Values Removed Values Added
First Time appeared Rabbitmq
Rabbitmq rabbitmq-server
Vendors & Products Rabbitmq
Rabbitmq rabbitmq-server

Sat, 17 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L'}

threat_severity

Moderate

Thu, 15 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 14 Oct 2026 16:30:00 +0000

Type Values Removed Values Added
Description RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.19, 4.0.24, 4.1.15, 4.2.10, and 4.3.5, the MQTT 5 parser in deps/rabbitmq_mqtt/src/rabbit_mqtt_packet.erl accepts Request-Problem-Information on PUBLISH packets even though the property is valid only for CONNECT. An authenticated publisher with topic write permission can cause the broker to store and route that inapplicable property to a separately authenticated matching subscriber. When the subscriber path serializes the outbound PUBLISH, serialise_prop/2 has no matching clause, and the uncontained function_clause exception closes the victim MQTT or Web MQTT connection. The publisher connection and broker remain available, and queued replay, retained-message persistence, and broker-wide denial of service were not established. This issue is fixed in versions 3.13.19, 4.0.24, 4.1.15, 4.2.10, and 4.3.5.
Title RabbitMQ MQTT 5: inapplicable PUBLISH property disconnects matching subscribers
Weaknesses CWE-1286
CWE-248
References
Metrics cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-10-14T17:53:16.254Z

Reserved: 2026-07-29T15:02:20.412Z

Link: CVE-2026-67418

cve-icon Vulnrichment

Updated: 2026-10-14T17:53:01.333Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-14T17:18:30.760

Modified: 2026-10-16T16:00:33.533

Link: CVE-2026-67418

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-14T16:07:29Z

Links: CVE-2026-67418 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-17T19:30:06Z

Weaknesses