CVE-2026-77409 rabbitmq CVE debrief

Who should care

Defenders responsible for RabbitMQ amqp091-go deployments should assess exposure and prioritize updating to version 1.13.0 or later to prevent potential connection issues. Defenders should review application-provided channels for proper handling of publisher confirmations and other events. They should also monitor for potential connection issues and missed heartbeats. Additionally, defenders should confirm whether affected product deployments exist in and

Why it matters

The vulnerability in RabbitMQ amqp091-go can cause connection stalls, missed heartbeats, deadlocks, and disconnection due to synchronous sending of publisher confirmations and other events to application-provided channels. Defenders should prioritize updating to version 1.13.0 or later and review application-provided channels for proper handling of these events.

• Potential connection stalls and missed heartbeats
• Possible deadlocks and disconnection
• Need to review and test application-provided channels for proper handling of publisher confirmations and other events
• Priority to update to version 1.13.0 or later

Technical summary

The vulnerability is caused by synchronous sending of publisher confirmations, flow-control events, consumer cancellations, returned messages, including NotifyConfirm events and connection block notifications, to application-provided channels. If a listener channel is unbuffered, full, or not drained promptly, the sole reader goroutine blocks and stops processing frames, acknowledgments, deliveries, and heartbeats.

Defensive priority

Defenders should prioritize updating to version 1.13.0 or later to prevent potential connection issues.

Recommended defensive actions

• Update to version 1.13.0 or later
• Review and test application-provided channels for proper handling of publisher confirmations and other events
• Monitor for potential connection issues and missed heartbeats
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The vulnerability is caused by synchronous sending of publisher confirmations, flow-control events, consumer cancellations, returned messages, including NotifyConfirm events and connection block notifications, to application-provided channels. If a listener channel is unbuffered, full, or not drained promptly, the sole reader goroutine blocks and stops processing frames, acknowledgments, deliveries, and heartbeats.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.