CVE-2026-44236rabbitmq-c: Heap buffer overflow in AMQP login handshake via undersized connection.tune.frame_max
Updated under an hour ago ()
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It affects alanxz rabbitmq-c. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
- Weakness (CWE)
- CWE-122
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Awaiting Analysis
- Record last updated
- Sep 21, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
alanxz rabbitmq-c alanxz:rabbitmq_c (from the name) | before 0.16.0 | CNA record |
References
- https://github.com/alanxz/rabbitmq-c/security/advisories/GHSA-jh48-qjf5-fx5vx-refsource-confirm
- https://github.com/alanxz/rabbitmq-c/pull/879x-refsource-misc
- https://github.com/alanxz/rabbitmq-c/commit/4777d0b5c58cb02966a04a85832436bd66ed5d1fx-refsource-misc
- https://github.com/alanxz/rabbitmq-c/releases/tag/v0.16.0x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.