Heap-based buffer overflow in RabbitMQ C client - CVE-2026-44236
Published: September 7, 2026
Vulnerability identifier: #VU147321
CSH Severity: Medium
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-44236
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a heap-based buffer overflow in amqp_login_inner() and the outbound frame buffer handling when processing a server-supplied connection.tune frame during the amqp_login() handshake. A remote attacker can send a connection.tune frame with an undersized frame_max value to cause a denial of service.
User interaction is required for a victim application to connect to the malicious AMQP server.
Affected software
RabbitMQ C client
Debian Linux
openEuler
librabbitmq
librabbitmq-debuginfo
librabbitmq-debugsource
librabbitmq-devel
librabbitmq-help
librabbitmq (Debian package)
Debian Linux
openEuler
librabbitmq
librabbitmq-debuginfo
librabbitmq-debugsource
librabbitmq-devel
librabbitmq-help
librabbitmq (Debian package)
How to mitigate CVE-2026-44236
Install security update from vendor's website.
RabbitMQ C client - update to 0.16.0
librabbitmq - update to 0.9.0-8
librabbitmq-debuginfo - update to 0.9.0-8
librabbitmq-debugsource - update to 0.9.0-8
librabbitmq-devel - update to 0.9.0-8
librabbitmq-help - update to 0.9.0-8
librabbitmq (Debian package) - update to 0.15.0-1+deb13u1
librabbitmq - update to 0.9.0-8
librabbitmq-debuginfo - update to 0.9.0-8
librabbitmq-debugsource - update to 0.9.0-8
librabbitmq-devel - update to 0.9.0-8
librabbitmq-help - update to 0.9.0-8
librabbitmq (Debian package) - update to 0.15.0-1+deb13u1