CVE-2026-67414 RabbitMQ AMQP 1.0 parser: amplification memory-exhaustion DoS via zero-width array aggregation
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-67414?
CVE-2026-67414 is a medium-severity vulnerability in rabbitmq-server, published on 14 Oct 2026.
Official description
RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.0.24, 4.1.15, 4.2.10, and 4.3.4, deps/amqp10_common/src/amqp10_binary_parser.erl materializes each element of AMQP 1.0 arrays whose shared constructor has zero width, while limiting only the number of elements in each array and not the aggregate arrays in a frame. After completing SASL authentication, a low-privilege client can send an ordinary frame containing many individually permitted arrays, causing a small frame to expand into a very large reader-process heap before later frame validation or authorization. Because deps/rabbit/src/rabbit_amqp_reader.erl clears the pre-authentication max_heap_size guard after login, repeated or concurrent frames can trigger the node-wide memory alarm, block publishers, or exhaust broker memory. This issue is fixed in versions 4.0.24, 4.1.15, 4.2.10, and 4.3.4.
Which versions are affected by CVE-2026-67414?
1 open source package ship an affected version, including rabbitmq.
| Package | Affected | Fixed in |
|---|---|---|
rabbitmq Bitnami | From 4.0.0 | 4.0.24, 4.1.15, 4.2.10, 4.3.4 |
How do I fix CVE-2026-67414?
Upgrade rabbitmq to a fixed version for your release line: 4.0.24, 4.1.15, 4.2.10 or 4.3.4.
Is CVE-2026-67414 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-67414 exists.
Sources
Also known as BIT-rabbitmq-2026-67414, DEBIAN-CVE-2026-67414, GHSA-w6mq-4qpx-v7mh, UBUNTU-CVE-2026-67414.