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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| rabbitmq | rabbitmq-server | >= 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 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | rabbitmq-server | 4.3.6-1 | — |
| Debian 13 | rabbitmq-server | No fix yet | — |
| Debian 12 | rabbitmq-server | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | rabbitmq-server | No fix yet | — |
| Ubuntu 26.04 LTS | rabbitmq-server | No fix yet | — |
| Ubuntu 24.04 LTS | rabbitmq-server | No fix yet | — |
| Ubuntu 22.04 LTS | rabbitmq-server | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | rabbitmq-server | No fix yet | — |
| Ubuntu Pro 18.04 LTS | rabbitmq-server | No fix yet | — |
| Ubuntu Pro 16.04 LTS | rabbitmq-server | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | rabbitmq-server4.3 | 4.3.6-1.1.hum1 | RHSA-2026:82703 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | rabbitmq-server | 3.13.7-11 | — |
Advisories 2
- WID-SEC-2026-2881 RabbitMQ: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 4, 2026
- RHSA-2026:82703 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 17, 2026
References
- https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-jv99-v328-mvmm
- https://github.com/rabbitmq/rabbitmq-server/pull/17035
- https://github.com/rabbitmq/rabbitmq-server/pull/17287
- https://github.com/rabbitmq/rabbitmq-server/commit/4639a4318c72a0660e4bc014767fad70ce288fbc
- https://github.com/rabbitmq/rabbitmq-server/commit/908f944a1d581d10774f8d6d0dcf2a1a713779fb
- https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.5