RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.3.3 and 4.2.9 and 4.1.14 and 4.0.23, Incomplete fix for CVE-2026-44838: escaperegexchar/1 does not escape -, leaving room for an MQTT topic permission bypass. the CVE-2026-44838 fix made expandtopicpermission/2 escape regex metacharacters in expanded topic-permission variables (escaperegex(V)), but escaperegexchar/1 escapes \ ^ $ . | ? + ( ) [ ] { } and omits -. When a topic permission template places {clientid} inside a [...] character class A low-privileged authenticated MQTT user controlling its clientid can broaden topic authorization (read and write) when templates embed {clientid} in a [...] This issue is fixed in versions 4.3.3 and 4.2.9 and 4.1.14 and 4.0.23.
References
| Link | Resource |
|---|---|
| https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9 | Release Notes |
| https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3 | Release Notes |
| https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-q46v-hrvq-hp24 | Vendor Advisory Exploit Mitigation |
Configurations
Configuration 1 (hide)
|
History
16 Oct 2026, 16:10
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:* | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.1 |
| First Time |
Broadcom rabbitmq Server
Broadcom |
|
| References | () https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9 - Release Notes | |
| References | () https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3 - Release Notes | |
| References | () https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-q46v-hrvq-hp24 - Vendor Advisory, Exploit, Mitigation |
25 Sep 2026, 17:17
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-09-25 17:17
Updated : 2026-10-16 16:10
NVD link : CVE-2026-67407
Mitre link : CVE-2026-67407
CVE.ORG link : CVE-2026-67407
JSON object : View
Products Affected
broadcom
- rabbitmq_server
CWE
CWE-862
Missing Authorization