Kurz gesagt
- CVE-2026-61634 ist eine Schwachstelle (NIEDRIG (CVSS 0.0)) in com.rabbitmq:amqp-client.
- Wahrscheinlichkeit einer Ausnutzung in den nächsten 30 Tagen (EPSS): 0.49%, höher als bei 42.0% aller Schwachstellen.
- Abhilfe: auf 5.33.0 oder neuer aktualisieren.
Description
Summary
The max body size was enforced to patch CVE-2023-46120, but even though that limit still works, the frame size itself still exceeds the given max size.
Root cause
The Java client records the AMQP 0-9-1 frame_max negotiated during connection tuning, but the socket inbound frame reader continues to validate broker-controlled payload lengths against the much larger maxInboundMessageBodySize limit. A broker peer can therefore send a method frame whose payload is larger than the negotiated frame_max, have it allocated and decoded, and complete the connection handshake instead of being rejected as a protocol violation.
Reported by Team Atlanta.
NVD description
The RabbitMQ Java client library allows Java and JVM-based applications to connect to and interact with RabbitMQ nodes. Prior to 5.33.0, the AMQP connection tuning path records the negotiated AMQP frame_max value, but src/main/java/com/rabbitmq/client/impl/SocketFrameHandler.java and NettyFrameHandlerFactory continue to validate broker-controlled frame payload lengths against maxInboundMessageBodySize because the negotiated limit is not applied consistently through setMaxInboundFramePayloadSize. A malicious or compromised broker can send a method frame larger than the negotiated frame_max during or after connection establishment, causing the client to allocate and decode a protocol-invalid frame instead of rejecting it with MalformedFrameException. The protocol violation can disrupt the affected connection and cause client-side denial of service. This issue is fixed in version 5.33.0.
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