CVE-2026-44838

RabbitMQ is a messaging and streaming broker. From 4.2.0 to before 4.2.4, RabbitMQ's MQTT plugin allows for topic-level authorization using regular expressions with variable substitution. Administrators can create patterns such as ^{client_id}-sensors$ to restrict user access to topics that include their client ID. However, the client_id is provided by the user in the MQTT CONNECT packet and is inserted into the regex pattern without escaping special regex characters. This flaw enables an authenticated MQTT user to inject regex operators to bypass authorization. This vulnerability is fixed in 4.2.4 and 4.3.0.

• CWE-863

• https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-x866-xp2g-cx8vVendor Advisory

Published

May 27, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

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