Vulnerability · Published Sep 25, 2026 · Assigned by GitHub_M
CVE-2026-67413RabbitMQ: Authenticated RabbitMQ JMS Topic Selector Users Can Consume Broker CPU with an Unbounded LIKE Regular Expression
Medium 6.0
In plain English
A medium-severity regular-expression denial of service in rabbitmq-server from rabbitmq. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.0.23, 4.1.14, 4.2.9, and 4.3.3, the optional rabbitmq_jms_topic_exchange plugin's x-jms-topic exchange accepted a client-controlled rjms_erlang_selector binding expression whose LIKE evaluator expanded percent and underscore wildcards into overlapping PCRE fragments. It executed those fragments with raw re:run/3 without match or recursion limits, allowing an authenticated tenant that can bind and publish to consume broker scheduler CPU and deny service with pathological selectors. This issue is fixed in versions 4.0.23, 4.1.14, 4.2.9, and 4.3.3.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | rabbitmq-server | no fix listed | DEBIAN-CVE-2026-67413 |
| Debian:13 | rabbitmq-server | no fix listed | DEBIAN-CVE-2026-67413 |
| Debian:14 | rabbitmq-server | 4.3.6-1 | DEBIAN-CVE-2026-67413 |
| Ubuntu:22.04:LTS | rabbitmq-server | no fix listed | UBUNTU-CVE-2026-67413 |
| Ubuntu:24.04:LTS | rabbitmq-server | no fix listed | UBUNTU-CVE-2026-67413 |
| Ubuntu:26.04:LTS | rabbitmq-server | no fix listed | UBUNTU-CVE-2026-67413 |
| Ubuntu:26.10 | rabbitmq-server | no fix listed | UBUNTU-CVE-2026-67413 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| rabbitmq | rabbitmq-server | >= 4.2.0, < 4.2.9>= 4.1.0, < 4.1.14>= 4.3.0, < 4.3.3>= 4.0.0, < 4.0.23 |
Weakness: CWE-1333 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References
- https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-chxf-3hfg-j8f7 x_refsource_CONFIRM
- https://github.com/rabbitmq/rabbitmq-server/commit/20203c50ea6ff459d462b2d4355326d3a870682c x_refsource_MISC
- https://github.com/rabbitmq/rabbitmq-server/commit/60de2fbbcd812ab294985cef260cc2f1b1a02a5b x_refsource_MISC
- https://github.com/rabbitmq/rabbitmq-server/commit/9e36b7f4c1e2eed77300288dca3e01bd9b23c432 x_refsource_MISC
- https://github.com/rabbitmq/rabbitmq-server/commit/f4d9da668b7304dfb9aeb2b4e9ff766a1275d021 x_refsource_MISC
- https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9 x_refsource_MISC
- https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3 x_refsource_MISC