---
title: "CVE-2026-66074\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2026-66074?format=md
keywords: index, follow
---

# CVE-2026-66074

Publication date 24 September 2026

Last updated 24 September 2026

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

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## 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.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| rabbitmq-server | 26.04 LTS resolute | Needs evaluation |
| 24.04 LTS noble | Needs evaluation |
| 22.04 LTS jammy | Needs evaluation |
| 20.04 LTS focal | Needs evaluation |
| 18.04 LTS bionic | Needs evaluation |
| 16.04 LTS xenial | Needs evaluation |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:
CVSS v4.0

**Base score**

6.0 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Attack requirements | Present |
  | Privileges required | Low |
  | User interaction | None |
  | Vulnerable system - Confidentiality impact | None |
  | Vulnerable system - Integrity impact | None |
  | Vulnerable system - Availability impact | High |
  | Subsequent system - Confidentiality impact | None |
  | Subsequent system - Integrity impact | None |
  | Subsequent system - Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 6.0 · Medium |
  | Base + Threat score | - |
  | Base + Environmental score | - |
  | Base + Threat + Environmental score | - |

**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

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-66074)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-66074)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-66074)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-66074)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-66074>
* <https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-rg5q-vcgf-rfh7>
* <https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6>
* <https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.0>