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Fencer Vulns
medium 6.5

CVE-2026-57217 json

RabbitMQ: Topic authorization can lead to cross-tenant routing-key bypass

published 2026-07-10 3 mo ago modified 2026-10-25 14 d ago also EUVD-2026-43024

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 29%
public exploits
0
none known

Summary

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.

Patch / fix

  • broadcom rabbitmq_server 4.2.6
  • rabbitmq-server Debian 14 4.3.0-2

debian advisories DEBIAN-CVE-2026-57217

  • rabbitmq-server4.3 hummingbird 1 4.3.2-1.hum1
  • rabbitmq-server4.2 hummingbird 1 4.2.8-1.hum1

red hat advisories RHSA-2026:35939RHSA-2026:35940

  • rabbitmq-server SLES 16.0, SLES for SAP applications 16.0 4.1.5-160000.2.1

suse advisories SUSE-SU-2026:23859-1SUSE-SU-2026:23869-1

  • rabbitmq-server openSUSE Leap 16.0 4.1.5-160000.2.1

opensuse advisories openSUSE-SU-2026:21903-1

  • rabbitmq-server Azure Linux 3.0 3.13.7-8

azure linux advisories AZL-92340

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-57217 updated cvss 6.5

rabbitmq: RabbitMQ: Authorization bypass allows unauthorized topic writes and binds during metadata-store failures

  • Red Hat Hardened Images rabbitmq-server4.2 4.2.8-1.hum1, rabbitmq-server4.3 4.3.2-1.hum1
    fixed: vendor fix RHSA-2026:35940
  • Red Hat OpenStack Platform 16.2 rabbitmq-server Red Hat OpenStack Platform 17.1 rabbitmq-server Red Hat OpenStack Platform 18.0 rabbitmq-server
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-gpvw-75h5-3wvx referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 7.0 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
CNA 4.0 7.0 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected products

  • rabbitmq rabbitmq-server

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.