CVE-2026-57220

Description

RabbitMQ is a messaging and streaming broker. Prior to 4.2.6, the RabbitMQ stream listener does not enforce the configured stream frame-size limit while assembling frames during authentication and before Tune negotiation, allowing an unauthenticated remote client to declare oversized frame lengths and consume broker memory in rabbit_stream_core. This issue is fixed in version 4.2.6.

References

• https://github.com/rabbitmq/rabbitmq-server/commit/595ec28fa1621b1f2c28124e4e0466a8ad963547
• https://github.com/rabbitmq/rabbitmq-server/commit/773a49c4921e8be990262a2d609c35916825679e
• https://github.com/rabbitmq/rabbitmq-server/pull/16171
• https://github.com/rabbitmq/rabbitmq-server/pull/16173
• https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6