Bug 2518034 (CVE-2026-69219)

Summary: CVE-2026-69219 com.rabbitmq/amqp-client: RabbitMQ Java client: Denial of Service via oversized memory allocation during pre-authentication
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 library. A malicious AMQP (Advanced Message Queuing Protocol) peer can exploit this by sending a specially crafted message during the pre-authentication phase. This message can cause the client to allocate an excessively large amount of memory, leading to an OutOfMemoryError. The resulting memory exhaustion can terminate the Java Virtual Machine (JVM), causing a denial of service for applications using the client.
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Description OSIDB Bzimport 2026-08-18 16:33:27 UTC 
The RabbitMQ Java client library allows Java and JVM-based applications to connect to and interact with RabbitMQ nodes. Prior to 5.33.1, src/main/java/com/rabbitmq/client/impl/ValueReader.java uses ValueReader.readBytes to accept a wire-declared contentLength below Integer.MAX_VALUE and allocate a byte array before checking the bytes available in the frame. A malicious AMQP peer can send a LongString or byte-array field with type tag S and a declared length such as 0x7FFFFFFE during the pre-authentication connection.start server-properties table, causing an approximately 2 GB allocation and OutOfMemoryError before readFully consumes data. The resulting memory exhaustion can terminate the JVM and cause denial of service. This issue is fixed in version 5.33.1.