CVE-2026-57216
RabbitMQ: AMQP 1.0, AMQP 0-9-1, Stream Protocol loopback enforcement can lead to remote guest sessions due to listener-address loopback checks
CVSS Score
6.8
EPSS Score
0.3%
EPSS Percentile
26th
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.
| CWE | CWE-287 |
| Vendor | rabbitmq |
| Product | rabbitmq-server |
| Published | Jul 10, 2026 |
| Last Updated | Jul 13, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None
Affected Versions
rabbitmq / rabbitmq-server
>= 4.2.0, < 4.2.6 >= 4.1.0, < 4.1.11 >= 4.0.0, < 4.0.21 >= 3.13.0, < 3.13.15
References
github.com: https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-36m6-588r-vqcw github.com: https://github.com/rabbitmq/rabbitmq-server/pull/15936 github.com: https://github.com/rabbitmq/rabbitmq-server/pull/15940 github.com: https://github.com/rabbitmq/rabbitmq-server/commit/7273c9eb6920abcde17b892dbe97ccaf906ead47 github.com: https://github.com/rabbitmq/rabbitmq-server/commit/9f8c39fcf0acbc43080ee7017a62a02832114112 github.com: https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6