{"id":"UBUNTU-CVE-2026-44236","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.","modified":"2026-09-24T02:00:16.880157487Z","published":"2026-06-11T00:00:00Z","related":["USN-8437-1","USN-8724-1"],"upstream":["CVE-2026-44236"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-44236"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-44236"},{"type":"REPORT","url":"https://github.com/alanxz/rabbitmq-c/security/advisories/GHSA-jh48-qjf5-fx5v"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8437-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8724-1"}],"affected":[{"package":{"name":"librabbitmq","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/librabbitmq?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.1-1ubuntu0.1~esm2"}]}],"versions":["0.3.0-1","0.4.1-1","0.4.1-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"amqp-tools","binary_version":"0.4.1-1ubuntu0.1~esm2"},{"binary_version":"0.4.1-1ubuntu0.1~esm2","binary_name":"librabbitmq1"}],"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44236.json"}},{"package":{"name":"librabbitmq","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/librabbitmq?arch=source&distro=esm-apps-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.7.1-1ubuntu0.2+esm1"}]}],"versions":["0.5.2-2","0.7.1-1","0.7.1-1ubuntu0.1","0.7.1-1ubuntu0.2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro","binaries":[{"binary_name":"amqp-tools","binary_version":"0.7.1-1ubuntu0.2+esm1"},{"binary_name":"librabbitmq4","binary_version":"0.7.1-1ubuntu0.2+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44236.json"}},{"package":{"name":"librabbitmq","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/librabbitmq?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.8.0-1ubuntu0.18.04.2+esm1"}]}],"versions":["0.8.0-1","0.8.0-1build1","0.8.0-1ubuntu0.18.04.1","0.8.0-1ubuntu0.18.04.2"],"ecosystem_specific":{"binaries":[{"binary_version":"0.8.0-1ubuntu0.18.04.2+esm1","binary_name":"amqp-tools"},{"binary_name":"librabbitmq4","binary_version":"0.8.0-1ubuntu0.18.04.2+esm1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44236.json"}},{"package":{"name":"librabbitmq","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/librabbitmq?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.10.0-1ubuntu0.20.04.1~esm1"}]}],"versions":["0.9.0-0.2","0.9.0-0.2ubuntu1","0.10.0-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.10.0-1ubuntu0.20.04.1~esm1","binary_name":"amqp-tools"},{"binary_version":"0.10.0-1ubuntu0.20.04.1~esm1","binary_name":"librabbitmq4"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44236.json"}},{"package":{"name":"librabbitmq","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/librabbitmq?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.10.0-1ubuntu2.1"}]}],"versions":["0.10.0-1","0.10.0-1build1","0.10.0-1ubuntu1","0.10.0-1ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_name":"amqp-tools","binary_version":"0.10.0-1ubuntu2.1"},{"binary_name":"librabbitmq4","binary_version":"0.10.0-1ubuntu2.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44236.json"}},{"package":{"name":"librabbitmq","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/librabbitmq?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.11.0-1ubuntu0.1"}]}],"versions":["0.11.0-1","0.11.0-1build1","0.11.0-1build2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"0.11.0-1ubuntu0.1","binary_name":"amqp-tools"},{"binary_version":"0.11.0-1ubuntu0.1","binary_name":"librabbitmq4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44236.json"}},{"package":{"name":"librabbitmq","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/librabbitmq?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.15.0-1ubuntu0.25.10.1"}]}],"versions":["0.15.0-1","0.15.0-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"amqp-tools","binary_version":"0.15.0-1ubuntu0.25.10.1"},{"binary_version":"0.15.0-1ubuntu0.25.10.1","binary_name":"librabbitmq4"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44236.json"}},{"package":{"name":"librabbitmq","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/librabbitmq?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.15.0-1ubuntu0.26.04.1"}]}],"versions":["0.15.0-1build1","0.15.0-1build2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"amqp-tools","binary_version":"0.15.0-1ubuntu0.26.04.1"},{"binary_name":"librabbitmq4","binary_version":"0.15.0-1ubuntu0.26.04.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-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"},{"type":"Ubuntu","score":"medium"}]}