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CVE-2026-67418— RabbitMQ MQTT 5: inapplicable PUBLISH property disconnects matching subscribers

Quick assessment

Affected
rabbitmq rabbitmq-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

RabbitMQ 是一个消息和流式代理（broker）。在版本 3.13.0 至 3.13.18、4.0.0 至 4.0.23、4.1.0 至 4.1.14、4.2.0 至 4.2.9 以及 4.3.0 至 4.3.4 中，MQTT 5 解析器（位于 ）会接受 PUBLISH 报文中的 Request-Problem-Information 字段，尽管该字段仅在 CONNECT 报文中是合法的。 拥有主题写入权限并经身份验证的发布者，可以导致代理（broker）将该不合法的属性进行存储，并将其路由给另一个独立认证的

CVSS 5.3 · Medium EPSS 0.40% · P33

Affected Version Matrix 5

VendorProduct Version RangeStatus
rabbitmq rabbitmq-server >= 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
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I. Basic Information for CVE-2026-67418

Vulnerability Information
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Vulnerability Title
RabbitMQ MQTT 5: inapplicable PUBLISH property disconnects matching subscribers
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1286
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
rabbitmq rabbitmq-server >= 3.13.0, < 3.13.19 -

II. Public POCs for CVE-2026-67418

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III. Intelligence Information for CVE-2026-67418

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Patches & Fixes for CVE-2026-67418 (4)

Vendor Pages for CVE-2026-67418 (1)

Other References for CVE-2026-67418 (1)

Same Patch Batch · rabbitmq · 2026-10-14 · 3 CVEs total

CVE-2026-67414 6.0 MEDIUM RabbitMQ AMQP 1.0 parser: amplification memory-exhaustion DoS via zero-width array aggrega
CVE-2026-67416 5.3 MEDIUM RabbitMQ: AMQP 1.0 symbolic body descriptor prefix collisions bypass validation

IV. Related Vulnerabilities

Same product: rabbitmq-server
Same vendor: rabbitmq
Same weakness: CWE-1286

V. Comments for CVE-2026-67418

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