CVE-2026-44236

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{"affected": [{"affectedData": [{"product": "rabbitmq-c", "vendor": "alanxz", "versions": [{"status": "affected", "version": "< 0.16.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-44236", "lastModified": "2026-09-24T15:02:58.307", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 4.2, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-44236", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-21T20:59:16.873744Z", "version": "2.0.3"}}]}, "published": "2026-09-17T18:16:44.503", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/alanxz/rabbitmq-c/commit/4777d0b5c58cb02966a04a85832436bd66ed5d1f"}, {"source": "security-advisories@github.com", "url": "https://github.com/alanxz/rabbitmq-c/pull/879"}, {"source": "security-advisories@github.com", "url": "https://github.com/alanxz/rabbitmq-c/releases/tag/v0.16.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/alanxz/rabbitmq-c/security/advisories/GHSA-jh48-qjf5-fx5v"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/alanxz/rabbitmq-c/security/advisories/GHSA-jh48-qjf5-fx5v"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-122"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "rabbitmq-c: rabbitmq-c: Heap buffer overflow leading to denial of service", "id": "2536500", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2536500"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-131", "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.", "A flaw was found in rabbitmq-c. A malicious AMQP (Advanced Message Queuing Protocol) server or an on-path attacker can send an undersized frame size during the login handshake. This can lead to a heap buffer overflow, causing memory corruption and potentially a denial of service. Code execution is theoretically possible but has not been demonstrated."], "name": "CVE-2026-44236", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "librabbitmq", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "librabbitmq", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "librabbitmq", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "librabbitmq", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-09-17T17:04:18Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-44236\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-44236\nhttps://github.com/alanxz/rabbitmq-c/commit/4777d0b5c58cb02966a04a85832436bd66ed5d1f\nhttps://github.com/alanxz/rabbitmq-c/pull/879\nhttps://github.com/alanxz/rabbitmq-c/releases/tag/v0.16.0\nhttps://github.com/alanxz/rabbitmq-c/security/advisories/GHSA-jh48-qjf5-fx5v"], "threat_severity": "Important"}

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