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VulnerabilityPublished Updated

CVE-2026-67418: Rabbitmq server · RabbitMQ is a messaging and streaming broker

Affects rabbitmq-serverSource GCVE Database

0
Authoritative record:CVE-2026-67418· Medium 5.3

Not known to be exploited · CVSS 5.3 Medium · fixed in 3.13.19 : update rabbitmq-server when convenient.

Data as of 28 Oct 2026, 22:28 UTC

CVSS 4.0 base score
5.3Medium
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 3.13.19
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

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 14 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
Ubuntu 26.10rabbitmq-serverpkg:deb/ubuntu/rabbitmq-server?arch=source&distro=stonkingOther threatsAffected
  • =4.0.5-10ubuntu5
  • =4.3.2-4ubuntu2
  • =4.3.2-4ubuntu3
Fixed in–
Ubuntu 26.04 LTSrabbitmq-serverpkg:deb/ubuntu/rabbitmq-server?arch=source&distro=resoluteOther threatsAffected
  • 4.0.5-8ubuntu2 – 4.0.5-10ubuntu5.2
8 affected builds
Fixed in–
Ubuntu 24.04 LTSrabbitmq-serverpkg:deb/ubuntu/rabbitmq-server?arch=source&distro=nobleOther threatsAffected
  • 3.12.1-1 – 3.12.1-1ubuntu1.7
6 affected builds
Fixed in–
Ubuntu 22.04 LTSrabbitmq-serverpkg:deb/ubuntu/rabbitmq-server?arch=source&distro=jammyOther threatsAffected
  • 3.8.9-3ubuntu1 – 3.9.27-0ubuntu0.6
13 affected builds
Fixed in–
Ubuntu Pro 20.04 LTSrabbitmq-serverpkg:deb/ubuntu/rabbitmq-server?arch=source&distro=esm-infra/focalOther threatsAffected
  • 3.7.8-4ubuntu2 – 3.8.3-0ubuntu0.3+esm2
13 affected builds
Fixed in–
Ubuntu Pro 18.04 LTSrabbitmq-serverpkg:deb/ubuntu/rabbitmq-server?arch=source&distro=esm-infra/bionicOther threatsAffected
  • 3.6.10-1 – 3.6.10-1ubuntu0.5+esm1
6 affected builds
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

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.

References

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