CVE-2026-67415: rabbitmq server from 4.2.0 (inclusive), before 4.2.9 (exclusive), from 4.3.0 (inclusive), before 4.3.3 (exclusive); +1…

Affected technology

rabbitmq server · from 4.2.0 (inclusive), before 4.2.9 (exclusive)
broadcom

rabbitmq server · from 4.3.0 (inclusive), before 4.3.3 (exclusive)
broadcom

rabbitmq-server · >= 4.3.0, < 4.3.3, >= 4.2.0, < 4.2.9
rabbitmq

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · High privileges required · No user interaction required

What an attacker can do

The attacker can exhaust the node-wide atom table and deny service, and malicious parameters are stored durably and reparsed when workers start, so atom pressure can recur after restart without a live attacker connection. Vendor/CNA’s CVSS 4.0 assessment (base score 5.9/10) rates confidentiality and integrity impact as none; availability impact as high.