{"id":"CVE-2026-44236","title":"rabbitmq-c is a C-language AMQP client library for RabbitMQ","summary":"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 l…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H","cwe":["CWE-122","CWE-131"],"vendor":"alanxz","product":"rabbitmq-c","affected":["rabbitmq-c < 0.16.0"],"published":"2026-09-17","updated":"2026-09-24","sourceUpdated":"2026-09-24T15:02:58.307","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-44236","references":[{"url":"https://github.com/alanxz/rabbitmq-c/commit/4777d0b5c58cb02966a04a85832436bd66ed5d1f","label":"security-advisories@github.com"},{"url":"https://github.com/alanxz/rabbitmq-c/pull/879","label":"security-advisories@github.com"},{"url":"https://github.com/alanxz/rabbitmq-c/releases/tag/v0.16.0","label":"security-advisories@github.com"},{"url":"https://github.com/alanxz/rabbitmq-c/security/advisories/GHSA-jh48-qjf5-fx5v","label":"security-advisories@github.com"},{"url":"https://github.com/alanxz/rabbitmq-c/security/advisories/GHSA-jh48-qjf5-fx5v","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44236.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-44236"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536500"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-44236"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44236"},{"url":"https://access.redhat.com/errata/RHSA-2026:75582"},{"url":"https://access.redhat.com/errata/RHSA-2026:84795"},{"url":"https://access.redhat.com/errata/RHSA-2026:82094"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat"],"epss":0.00403,"epssPercentile":0.34335,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-21T20:59:16.873744Z"},"scores":{"nvd":7.1,"vendor":6.5},"ingestedAt":"2026-09-17T17:23:30.699Z","patched":["enterprise_linux_appstream_v_8","enterprise_linux_baseos_v_8","enterprise_linux_crb_v_8"],"slug":"CVE-2026-44236","body":"## Overview\n\nrabbitmq-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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 7 · no fix planned: Red Hat Enterprise Linux 7 · updated 2026-10-19 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44236.json)\n- **RHSA-2026:75582** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-10-05 · [advisory](https://access.redhat.com/errata/RHSA-2026:75582)\n- **RHSA-2026:84795** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-10-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:84795)\n- **RHSA-2026:82094** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82094)","depth":"midnight","depthScore":51,"depthScoreParts":{"impact":39.1,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":208807,"id":"CVE-2026-44236","ts":1790027671242,"field":"exploit_available","old":"false","new":"true"}]}