Medium 6.8Published Jul 10, 2026

CVE-2026-57216RabbitMQ: AMQP 1.0, AMQP 0-9-1, Stream Protocol loopback enforcement can lead to remote guest sessions due to listener-address loopback checks

Updated under an hour ago (Oct 27, 2026, 11:00 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

RabbitMQ is a messaging and streaming broker. Prior to 3.13.15, 4.0.20, 4.1.11, and 4.2.6, AMQP 0-9-1, AMQP 1.0, and Stream Protocol authentication can allow a loopback-restricted user such as guest to connect remotely when traffic is accepted through a trusted PROXY-protocol path and the backend listener is loopback-bound because the loopback check uses the listener-side socket address instead of the real client source. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, and 4.2.6.

CVSS: 6.8 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
Weakness (CWE): CWE-287
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jul 13, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

rabbitmq rabbitmq-server rabbitmq:server (from the name)	from 4.2.0, < 4.2.6; from 4.1.0, < 4.1.11; from 4.0.0, < 4.0.21; from 3.13.0, < 3.13.15	CNA record
broadcom rabbitmq_server broadcom:rabbitmq_server	from 3.13.0 before 3.13.15; from 4.0.0 before 4.0.20; from 4.1.0 before 4.1.11; from 4.2.0 before 4.2.6	NVD

References

References

https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-36m6-588r-vqcw	x-refsource-confirm, exploit, vendor-advisory
https://github.com/rabbitmq/rabbitmq-server/pull/15936	x-refsource-misc, issue-tracking, patch
https://github.com/rabbitmq/rabbitmq-server/pull/15940	x-refsource-misc, issue-tracking, patch
https://github.com/rabbitmq/rabbitmq-server/commit/7273c9eb6920abcde17b892dbe97ccaf906ead47	x-refsource-misc, patch
https://github.com/rabbitmq/rabbitmq-server/commit/9f8c39fcf0acbc43080ee7017a62a02832114112	x-refsource-misc, patch
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.