| Name | CVE-2026-66067 |
| Description | RabbitMQ is a messaging and streaming broker. Prior to versions 4.2.7 and 4.3.1, The stream open handler calls only check_vhost_access; it omits the node/vhost/user connection-limit checks that rabbit_reader performs for AMQP. A developer %% FIXME comment at the cited line explicitly acknowledges the gap. No compensating enforcement exists in connection tracking or elsewhere in rabbitmq_stream. An authenticated tenant can fully bypass operator-configured per-user and per-vhost connection caps by connecting via port 5552 instead of 5672. Preconditions include rabbitmq_stream plugin enabled Authenticated stream-protocol credentials Operator relies on per-user/per-vhost connection limits for tenant isolation. This issue is fixed in versions 4.2.7 and 4.3.1. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| rabbitmq-server (PTS) | bookworm, bookworm (security) | 3.10.8-1.1+deb12u1 | fixed |
| trixie | 4.0.5-6+deb13u2 | fixed |
| forky, sid | 4.3.2-4 | vulnerable |
The information below is based on the following data on fixed versions.
Notes
[trixie] - rabbitmq-server <not-affected> (Vulnerable code not present, only affects 4.2 and later)
[bookworm] - rabbitmq-server <not-affected> (Vulnerable code not present, only affects 4.2 and later)
https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-hwqx-2gfg-89qf