CVE-2026-57220 rabbitmq CVE debrief

Who should care

Users of RabbitMQ versions prior to 4.2.6 should apply the patch to prevent potential denial of service attacks. This includes RabbitMQ administrators, security teams, and operators responsible for maintaining RabbitMQ deployments.

Technical summary

The RabbitMQ stream listener does not enforce the configured stream frame-size limit while assembling frames during authentication and before Tune negotiation. This allows an unauthenticated remote client to declare oversized frame lengths and consume broker memory in rabbit_stream_core. The issue is addressed in RabbitMQ version 4.2.6. Affected systems should be upgraded to prevent potential denial of service attacks. The vulnerability can be mitigated by reviewing and adjusting the stream frame-size limit configuration. Furthermore, administrators should monitor RabbitMQ for unusual activity to detect potential exploitation attempts.

Defensive priority

Apply the patch to prevent potential denial of service attacks. Review and adjust the stream frame-size limit configuration. Monitor RabbitMQ for unusual activity.

Recommended defensive actions

• Apply the patch to upgrade RabbitMQ to version 4.2.6 or later
• Review and adjust the stream frame-size limit configuration
• Monitor RabbitMQ for unusual activity
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-10T21:16:59.180Z and has not been modified since then. The NVD entry is currently 7.5 HIGH. There is limited source detail available for CVE-2026-57220. Defensive verification tasks are recommended to confirm affected scope and severity.

Official resources