🛡️ CVE-2026-44838
🟠 CVSS 8.1 — High ✅ No Known Exploit NVD
8.1
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

Details

Severity MEDIUM
CVSS Score 8.1
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-05-29
Updated 2026-06-05
Modified 2026-05-29
Fix URL N/A

Affected Packages

Software From version Fixed in
rabbitmq — —
rabbitmq-server 4.2.0 4.2.4
unknown — —

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