CVE-2026-69219: Rabbitmq Rabbitmq-Java-Client

High severity, CVSS 8.7. EPSS: 0.7% chance of exploitation in the next 30 days.

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.

Affected products

• Rabbitmq Rabbitmq-Java-Client: before 5.33.1 (fixed in 5.33.1)

Published 2026-08-18. Last modified 2026-09-18.