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Fencer Vulns
medium 5.3

CVE-2026-67418 json

RabbitMQ MQTT 5: inapplicable PUBLISH property disconnects matching subscribers

published 2026-10-14 25 d ago modified 2026-10-21 18 d ago also BIT-rabbitmq-2026-67418 , EUVD-2026-101419 , GHSA-jv99-v328-mvmm

cvss
5.3
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami rabbitmq 3.13.19, 4.0.24, 4.1.15, 4.2.10, 4.3.5
  • vmware rabbitmq 3.13.19, 4.0.24, 4.1.15, 4.2.10, 4.3.5
  • pivotal_software rabbitmq 3.13.19, 4.0.24, 4.1.15, 4.2.10, 4.3.5
  • rabbitmq-server Debian 14 4.3.6-1

debian advisories DEBIAN-CVE-2026-67418

  • rabbitmq-server4.3 hummingbird 1 4.3.6-1.1.hum1

red hat advisories RHSA-2026:82703

  • rabbitmq-server Azure Linux 3.0 3.13.7-11

azure linux advisories AZL-108480

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-67418 updated cvss 4.3

rabbitmq-server: rabbitmq-server: Denial of Service via invalid MQTT PUBLISH property

  • Red Hat Hardened Images rabbitmq-server4.2 4.2.9-0.3.hum1
    affected: no fix planned “Will not fix”
  • Red Hat OpenStack Platform 13 (Queens) rabbitmq-server Red Hat OpenStack Platform 16.2 rabbitmq-server Red Hat OpenStack Platform 17.1 rabbitmq-server
    affected: no fix planned “Out of support scope”
  • Red Hat OpenStack Platform 18.0 rabbitmq-server
    affected: no fix available “Fix deferred”
  • Red Hat Hardened Images rabbitmq-server4.3 4.3.6-1.1.hum1
    fixed: vendor fix RHSA-2026:82703

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
25 d ago

Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 5.3 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
CNA 4.0 5.3 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected packages

ecosystem package affected fixed in
bitnami rabbitmq
>=3.13.0, <3.13.19
>=4.0.0, <4.0.24
>=4.1.0, <4.1.15
>=4.2.0, <4.2.10
>=4.3.0, <4.3.5
3.13.19
4.0.24
4.1.15
4.2.10
4.3.5

Affected products

  • rabbitmq rabbitmq-server

Classification

Weakness
  • CWE-1286 Improper Validation of Syntactic Correctness of Input
  • CWE-248 Uncaught Exception

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.