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CVE-2026-66074

6.5 · MEDIUM

RabbitMQ is a messaging and streaming broker.

Published Sep 23, 2026broadcomCWE-1333EPSS 0.39%

Overview

CVE-2026-66074 is a medium-severity vulnerability affecting broadcom rabbitmq_server. It was published on September 23, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0, match_value/3 passes the user-supplied ?name= regular expression to re:run with no match_limit option, and executes it once per resource in the result set. OTP's default 10M match_limit caps each call at roughly 100-200ms, but the regex runs once per resource in the result set. With a large set, for example 5000 queues at 150ms each, a single request consumes 12 or more minutes of CPU. Parallel requests saturate the schedulers. The use_regex=true option is a supported feature on list endpoints, so this path is reachable through normal API use. Preconditions include Any user with the management tag can exploit this.. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0.

Remediation

Check the references section for vendor advisories and patches from broadcom. Update rabbitmq_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
broadcomrabbitmq_server>= 3.13.0, < 3.13.15Affected

References

GitHubgithub.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6GitHubgithub.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.0GitHubgithub.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-rg5q-vcgf-rfh7

How CyberStrike helps

Frequently asked questions

What is CVE-2026-66074?

CVE-2026-66074 is a medium-severity vulnerability affecting broadcom rabbitmq_server. It was published on September 23, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-66074?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-66074?

Check the references section for vendor advisories and patches from broadcom. Update rabbitmq_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-66074?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-66074 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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