CVE-2026-66080
Medium
Description
RabbitMQ is a messaging and streaming broker. Prior to versions 4.1.11, 4.2.6, and 4.3.0, validate_partitions only checks that the requested partition count is at least 1, with no upper bound. A large count such as lists:seq(0, 500000000) allocates roughly 8GB. Preconditions include The rabbitmq_stream_management plugin must be enabled. The caller needs the management tag and access to the target vhost.. This issue is fixed in versions 4.1.11, 4.2.6, and 4.3.0.
SeverityMedium
CVSS4.9
Exploit probability—
Product
Broadcom Rabbitmq Server
PublishedSep 23, 2026
First seenSep 23, 2026
Weakness typeCWE-770Allocation of resources without limits
How to fix
Update
- broadcom rabbitmq_server4.1.11, 4.2.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| broadcom rabbitmq_server | 4.1.0 ≤ v < 4.1.11, 4.2.0 ≤ v < 4.2.6 | 4.1.11, 4.2.6 |
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