Vulnerability · Published Sep 17, 2026 · Assigned by GitHub_M
CVE-2026-44236rabbitmq-c: Heap buffer overflow in AMQP login handshake via undersized connection.tune.frame_max
High 7.1
In plain English
A high-severity heap buffer overflow in rabbitmq-c from alanxz. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | librabbitmq | 0.14.0-3.el10_2.1 | ALSA-2026:84795 |
| AlmaLinux:9 | librabbitmq | 0.11.0-7.el9_8.1 | ALSA-2026:82094 |
| AlmaLinux:10 | librabbitmq-devel | 0.14.0-3.el10_2.1 | ALSA-2026:84795 |
| AlmaLinux:8 | librabbitmq-devel | 0.9.0-6.el8_10 | ALSA-2026:75582 |
| AlmaLinux:9 | librabbitmq-devel | 0.11.0-7.el9_8.1 | ALSA-2026:82094 |
| AlmaLinux:10 | librabbitmq-tools | 0.14.0-3.el10_2.1 | ALSA-2026:84795 |
| AlmaLinux:9 | librabbitmq-tools | 0.11.0-7.el9_8.1 | ALSA-2026:82094 |
| Debian:12 | librabbitmq | 0.11.0-1+deb12u2 | DEBIAN-CVE-2026-44236 |
| Debian:13 | librabbitmq | 0.15.0-1+deb13u1 | DEBIAN-CVE-2026-44236 |
| Debian:14 | librabbitmq | 0.16.0-1 | DEBIAN-CVE-2026-44236 |
| Rocky Linux:10 | librabbitmq | 0:0.14.0-3.el10_2.1 | RLSA-2026:84795 |
| Rocky Linux:8 | librabbitmq | 0:0.9.0-6.el8_10 | RLSA-2026:75582 |
| Rocky Linux:9 | librabbitmq | 0:0.11.0-7.el9_8.1 | RLSA-2026:82094 |
| Ubuntu:22.04:LTS | librabbitmq | 0.10.0-1ubuntu2.2 | USN-8724-1 |
| Ubuntu:22.04:LTS | librabbitmq | 0.10.0-1ubuntu2.1 | USN-8437-1 |
| Ubuntu:22.04:LTS | librabbitmq | 0.10.0-1ubuntu2.1 | UBUNTU-CVE-2026-44236 |
| Ubuntu:24.04:LTS | librabbitmq | 0.11.0-1ubuntu0.1 | USN-8437-1 |
| Ubuntu:24.04:LTS | librabbitmq | 0.11.0-1ubuntu0.1 | UBUNTU-CVE-2026-44236 |
| Ubuntu:24.04:LTS | librabbitmq | 0.11.0-1ubuntu0.2 | USN-8724-1 |
| Ubuntu:25.10 | librabbitmq | 0.15.0-1ubuntu0.25.10.1 | USN-8437-1 |
| Ubuntu:25.10 | librabbitmq | 0.15.0-1ubuntu0.25.10.1 | UBUNTU-CVE-2026-44236 |
| Ubuntu:26.04:LTS | librabbitmq | 0.15.0-1ubuntu0.26.04.1 | USN-8437-1 |
| Ubuntu:26.04:LTS | librabbitmq | 0.15.0-1ubuntu0.26.04.1 | UBUNTU-CVE-2026-44236 |
| Ubuntu:26.04:LTS | librabbitmq | 0.15.0-1ubuntu0.26.04.2 | USN-8724-1 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| alanxz | rabbitmq-c | < 0.16.0 |
Weakness: CWE-122 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
References
- https://github.com/alanxz/rabbitmq-c/security/advisories/GHSA-jh48-qjf5-fx5v x_refsource_CONFIRM
- https://github.com/alanxz/rabbitmq-c/pull/879 x_refsource_MISC
- https://github.com/alanxz/rabbitmq-c/commit/4777d0b5c58cb02966a04a85832436bd66ed5d1f x_refsource_MISC
- https://github.com/alanxz/rabbitmq-c/releases/tag/v0.16.0 x_refsource_MISC