UBUNTU-CVE-2026-44236

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UBUNTU-CVE-2026-44236

Summary:

Details: rabbitmq-c is a C-language AMQP client library for RabbitMQ. Prior to 0.16.0, a malicious AMQP server can send an undersized connection.tune.frame_max value during amqp_login(), and rabbitmq-c accepts the value in amqp_login_inner() in librabbitmq/amqp_socket.c. amqp_tune_connection() in librabbitmq/amqp_connection.c uses frame_max to reallocate the outbound buffer without enforcing AMQP_FRAME_MIN_SIZE. Immediate serialization of connection.tune-ok through amqp_frame_to_bytes() writes beyond the undersized heap allocation, causing memory corruption and likely denial of service. An on-path attacker can also trigger the flaw against plaintext AMQP traffic. Code execution is theoretically possible but was not demonstrated. This issue is fixed in version 0.16.0.

References: https://ubuntu.com/security/CVE-2026-44236, https://www.cve.org/CVERecord?id=CVE-2026-44236, https://github.com/alanxz/rabbitmq-c/security/advisories/GHSA-jh48-qjf5-fx5v, https://ubuntu.com/security/notices/USN-8437-1, https://ubuntu.com/security/notices/USN-8724-1