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rabbitmq-server

CVE-2026-66079 is a vulnerability in RabbitMQ server versions prior to 3.13.15, 4.0.20, 4.1.11, and 4.2.6. It allows an unauthenticated network attacker to crash any RabbitMQ node with the AMQP 1.0 listener enabled by sending a specially crafted ~19-byte frame. The flaw arises from improper parsing of a list element count, leading to excessive memory allocation and termination of the Erlang VM, causing denial of service. The issue is fixed in the specified versions.

RabbitMQ's AMQP 1.0 listener improperly parses the SASL-mechanisms / SASL-init frame before authentication completes. Specifically, the parse_array_primitive/2 function for constructor 0x45 (list0) returns elements with zero byte-width, but the enclosing array32 parser loops based on a 4-byte Count field from the wire. An attacker can send a frame with a Count value of 0xFFFFFFFF, causing the parser to attempt to build a list of approximately 4 billion empty elements without consuming input, exhausting heap memory. This leads to termination of the Erlang VM and a denial of service on the node. No authentication is required to exploit this, and network reachability to the AMQP listener (default port 5672) is sufficient. The vulnerability is addressed in RabbitMQ versions 3.13.15, 4.0.20, 4.1.11, and 4.2.6.

CVE-2026-66079 is a vulnerability in RabbitMQ server versions prior to 3.13.15, 4.0.20, 4.1.11, and 4.2.6. It allows an unauthenticated network attacker to crash any RabbitMQ node with the AMQP 1.0 listener enabled by sending a specially crafted ~19-byte frame. The flaw arises from improper parsing 

Rabbitmq server: RabbitMQ is a messaging and streaming broker. (CVE-2026-66079)

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