Improper Check for Unusual or Exceptional Conditions in RabbitMQ Server - #VU143933
Published: August 18, 2026
Vulnerability identifier: #VU143933
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-754
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 improper handling of an empty array in rabbitmq consistent-hash exchange routing when dead-lettering messages through an x-consistent-hash exchange configured with a hash-header and at least two buckets. A remote user can publish a message with an empty AMQP field-array header value to cause a denial of service.
Exploitation requires the rabbitmq_consistent_hash_exchange plugin to be enabled, a classic queue to dead-letter through the vulnerable exchange topology, and the attacker-controlled message to be routed into that queue.
Affected software
RabbitMQ Server
Remediation
Install security update from vendor's website.
RabbitMQ Server - addressed in versions 4.2.10, 4.3.5