{"id":"BIT-rabbitmq-c-2026-44236","summary":"rabbitmq-c: Heap buffer overflow in AMQP login handshake via undersized connection.tune.frame_max","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.","aliases":["CVE-2026-44236","GHSA-jh48-qjf5-fx5v"],"modified":"2026-09-29T10:10:41.117513482Z","published":"2026-09-29T08:56:07.627Z","database_specific":{"severity":"High","cpes":["cpe:2.3:a:rabbitmq-c_project:rabbitmq-c:*:*:*:*:*:*:*:*"]},"references":[{"type":"WEB","url":"https://github.com/alanxz/rabbitmq-c/commit/4777d0b5c58cb02966a04a85832436bd66ed5d1f"},{"type":"WEB","url":"https://github.com/alanxz/rabbitmq-c/pull/879"},{"type":"WEB","url":"https://github.com/alanxz/rabbitmq-c/releases/tag/v0.16.0"},{"type":"WEB","url":"https://github.com/alanxz/rabbitmq-c/security/advisories/GHSA-jh48-qjf5-fx5v"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44236"}],"affected":[{"package":{"name":"rabbitmq-c","ecosystem":"Bitnami","purl":"pkg:bitnami/rabbitmq-c"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.16.0"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/rabbitmq-c/BIT-rabbitmq-c-2026-44236.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H"}]}],"schema_version":"1.9.0"}