CVE-2026-66080

EUVD-2026-85637

23.09.2026, 21:16

RabbitMQ is a messaging and streaming broker. Prior to versions 4.1.11, 4.2.6, and 4.3.0, validate_partitions only checks that the requested partition count is at least 1, with no upper bound. A large count such as lists:seq(0, 500000000) allocates roughly 8GB. Preconditions include The rabbitmq_stream_management plugin must be enabled. The caller needs the management tag and access to the target vhost.. This issue is fixed in versions 4.1.11, 4.2.6, and 4.3.0.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	4.9 MEDIUM	NETWORK	LOW	HIGH	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Base Score

CVSS 3.x

EPSS Score

Percentile: 24.72%

Affected Products (NVD)

Vendor	Product	Version
broadcom	rabbitmq_server	4.1.0 ≤ 𝑥 < 4.1.11
broadcom	rabbitmq_server	4.2.0 ≤ 𝑥 < 4.2.6

𝑥

= Vulnerable software versions

Debian Releases

Debian Product

Codename

rabbitmq-server

bookworm	3.10.8-1.1+deb12u1 fixed
bookworm (security)	3.10.8-1.1+deb12u1 fixed
forky	4.3.6-1 fixed
sid	4.3.6-1 fixed
trixie	vulnerable

Ubuntu Releases

Ubuntu Product

Codename

rabbitmq-server

bionic	needs-triage
focal	needs-triage
jammy	needs-triage
noble	needs-triage
resolute	needs-triage
stonking	not-affected
xenial	needs-triage

Common Weakness Enumeration

CWE-770 - Allocation of Resources Without Limits or Throttling
The software allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.

References

https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6

https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.0

https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-wg79-5449-m728