CVE-2026-67419
Medium
Description
RabbitMQ is a messaging and streaming broker. Prior to 4.3.5, an authenticated user who can bind a queue to a topic exchange and publish to it can use consecutive # segments in a binding key to make both topic matchers revisit the same trie-node and routing-key-suffix states without memoization. The matcher materializes duplicate destinations before deduplication, causing combinatorial CPU work and memory pressure that can disrupt routing for all tenants. This vulnerability is fixed in 4.3.5.
SeverityMedium
CVSS6.5
Exploit probability—
Product
Broadcom Rabbitmq Server
PublishedSep 25, 2026
First seenSep 25, 2026
Weakness typeCWE-407CWE-407CWE-1333CWE-1333
How to fix
Update
- broadcom rabbitmq_server4.3.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| broadcom rabbitmq_server | 4.3.0 ≤ v < 4.3.5 | 4.3.5 |
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