Bug 2535589 (CVE-2026-75516)

Summary: CVE-2026-75516 com.rabbitmq/amqp-client: RabbitMQ Java client: Denial of Service via oversized frames
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: fmongiar, gmalinko, janstey, jnethert, pdelbell, rstepani
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the RabbitMQ Java client. A malicious AMQP (Advanced Message Queuing Protocol) server, or a man-in-the-middle attacker, can modify connection parameters and inject oversized frames. This can cause the client to allocate a large amount of memory, leading to memory exhaustion and potentially terminating the client process. This vulnerability results in a Denial of Service (DoS) for applications using the client library.
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Description OSIDB Bzimport 2026-09-16 18:41:26 UTC 
The RabbitMQ Java client library allows Java and JVM-based applications to connect to and interact with RabbitMQ nodes. Prior to 5.34.0, AMQConnection.start() applies Math.min(maxInboundMessageBodySize, frameMax) after Connection.Tune negotiation even though AMQP defines frameMax value zero as unlimited and ConnectionFactory.DEFAULT_FRAME_MAX is zero. When the client default and server-negotiated value are both zero, the result is passed to Utils.framePayloadLimit(int), which interprets zero as Integer.MAX_VALUE and disables the configured maxInboundMessageBodySize cap. A malicious AMQP server, or a man-in-the-middle attacker able to modify Connection.Tune and inject frames into the connection, can then send an oversized frame of any frame type, causing Frame.readFrom() to allocate a large byte array before content-level validation and potentially terminate the client process through memory exhaustion. This issue is fixed in version 5.34.0.