# CVE-2026-57220: RabbitMQ: Stream listener does not enforce configured frame-size limit during authentication, permitting unauth'd mem-exhaust DoS

CVE-2026-57220 is fixed in rabbitmq-server on 1 platform, first by OPENSUSE-SU-2026:21903-1, released September 22, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-57220
- Priority: High
- CVSS: 7.5 (Important)
- EPSS: 0.0055
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 15, 2026
- Weakness: Allocation of Resources Without Limits or Throttling
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-57220

## Description

This update for rabbitmq-server fixes the following issues:  - CVE-2026-44839: XSS in management UI due to unsanitized vhost names (bsc#1266465). - CVE-2026-57212: The rabbitmq_management HTTP API accepts oversized valid JSON bodies on with_decode and direct_request   paths (bsc#1271318). - CVE-2026-57213: stored XSS in RabbitMQ federation management plugin via unsanitized consumer_tag rendering   (bsc#1271336). - CVE-2026-57214: stored XSS in RabbitMQ management UI (bsc#1271337). - CVE-2026-57215: direct-reply-to binding persistence can lead to unauthorized reply-channel injection and persistent   phantom (bsc#1271338). - CVE-2026-57216: stream Protocol loopback enforcement can lead to remote guest sessions due to listener-address   loopback checks (bsc#1271339). - CVE-2026-57217: topic authorization can lead to cross-tenant routing-key bypass (bsc#1271340). - CVE-2026-57218: consumer persistence can lead to post-revocation message disclosure in OAuth2 (bsc#1271343). - CVE-2026-57219: Unauthenticated disclosure of OAuth client credentials via an HTTP API endpoint with certain less   common OAuth 2 configurations (bsc#1271344). - CVE-2026-57220: stream listener does not enforce configured frame-size limit during authentication, permitting   unauth'd mem-exhaust DoS (bsc#1271345). - CVE-2026-57221: passive queue/exchange declaration bypasses authorization checks, leaking queue metadata to   unprivileged users (bsc#1271346).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | rabbitmq-server opensuse-leap 16.0 | 4.1.5-160000.2.1 | [OPENSUSE-SU-2026:21903-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21903-1.md) | Sep 22, 2026 |
| Linux | rabbitmq-server sles 16.0 | 4.1.5-160000.2.1 | [SUSE-SU-2026:23869-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23869-1.md) | Sep 22, 2026 |

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Data as of 2026-11-10T13:56:55Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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