Inefficient Algorithmic Complexity in RabbitMQ Server - #VU143936
Published: August 18, 2026
Vulnerability identifier: #VU143936
CSH Severity: Low
CVSS v4: 6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-407
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to inefficient algorithmic complexity in direct reply-to address resolution and volatile target handling when processing forged direct reply-to routing keys in the AMQP CC header. A remote user can send a specially crafted AMQP message with many distinct forged suffixes to cause a denial of service.
Exploitation requires an authenticated AMQP account with permission to write to the default exchange and activation of direct reply-to to obtain a generated reply address.
Affected software
RabbitMQ Server
Remediation
Install security update from vendor's website.
RabbitMQ Server - addressed in versions 4.2.10, 4.3.5