{"id":"CVE-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":["GHSA-jh48-qjf5-fx5v"],"modified":"2026-09-18T03:46:37.860833677Z","published":"2026-09-17T17:04:18.803Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-122"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44236.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44236.json"},{"type":"FIX","url":"https://github.com/alanxz/rabbitmq-c/commit/4777d0b5c58cb02966a04a85832436bd66ed5d1f"},{"type":"FIX","url":"https://github.com/alanxz/rabbitmq-c/pull/879"},{"type":"WEB","url":"https://github.com/alanxz/rabbitmq-c/releases/tag/v0.16.0"},{"type":"ADVISORY","url":"https://github.com/alanxz/rabbitmq-c/security/advisories/GHSA-jh48-qjf5-fx5v"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44236"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/alanxz/rabbitmq-c","events":[{"introduced":"0"},{"fixed":"800d57c9ca7352181167ec3c6aba66b8518c321c"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"0.16.0"}],"source":"AFFECTED_FIELD"}}],"versions":["v0.15.0","v0.14.0","v0.13.0","v0.12.0","v0.11.0","v0.10.0","v0.9.0-master","v0.8.0","v0.7.1","v0.7.0","v0.6.0","v0.5.2","v0.5.1","v0.5.0","v0.4.0","v0.4.0-test","v0.3.0","rabbitmq-c-v0.3.0","v0.2","0.2","v0.1","librabbitmq-0.1-amqp_0_8"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44236.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H"}]}