Is CVE-2026-66074 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-66074 being exploited in the wild.

How severe is CVE-2026-66074?

Informational severity, published 23 September 2026.

Which products and versions are affected?

RabbitMQ 3.13.0 to 3.13.14, 4.0.0 to 4.0.19, 4.1.0 to 4.1.10, 4.2.0 to 4.2.5.

Is there a fix for CVE-2026-66074?

A patch was published on 2026-04-23: Versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0 contain the fix Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-66074 attacked?

It is attacked over the network.

Am I affected by CVE-2026-66074?

Check whether you run RabbitMQ at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-66074: RabbitMQ regex denial of service in management API

CVE-2026-66074 · Severity: info · Published 2026-09-23

RabbitMQ is a message broker used to queue and route data between applications. The management API allows authenticated users to filter resources by name using regular expressions, but certain patterns can cause excessive CPU consumption. An attacker with management credentials could craft a malicious regex filter to make a single API request consume many minutes of CPU time, potentially disrupting the service for legitimate users.

Technologies: RabbitMQ. Vendors: RabbitMQ.

Quick answers

Is CVE-2026-66074 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-66074 being exploited in the wild.
How severe is CVE-2026-66074?: Informational severity, published 23 September 2026.
Which products and versions are affected?: RabbitMQ 3.13.0 to 3.13.14, 4.0.0 to 4.0.19, 4.1.0 to 4.1.10, 4.2.0 to 4.2.5.
Is there a fix for CVE-2026-66074?: A patch was published on 2026-04-23: Versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0 contain the fix Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-66074 attacked?: It is attacked over the network.
Am I affected by CVE-2026-66074?: Check whether you run RabbitMQ at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The match_value/3 function passes user-supplied regex patterns to Erlang's re:run without enforcing a match_limit, executing the regex once per resource in the result set. With a large dataset (e.g., 5000 queues), a single request can consume excessive CPU time, and parallel requests saturate scheduler threads. Precondition is possession of the management tag; the use_regex=true parameter is a supported feature on list endpoints, making this reachable through normal API use.

Affected products

RabbitMQ RabbitMQ 3.13.0 to 3.13.14, 4.0.0 to 4.0.19, 4.1.0 to 4.1.10, 4.2.0 to 4.2.5

Timeline

2026-09-23: disclosed
2026-04-23: patched: Versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0 contain the fix

References

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