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RabbitMQ: Stream protocol skips per vhost per user connection limits

Type: advisorySource: OSV1 source record

RabbitMQ is a messaging and streaming broker. Prior to versions 4.2.7 and 4.3.1, The stream open handler calls only check_vhost_access; it omits the node/vhost/user connection-limit checks that rabbit_reader performs for AMQP. A developer %% FIXME comment at the cited line explicitly acknowledges the gap. No compensating enforcement exists in connection tracking or elsewhere in rabbitmq_stream. An authenticated tenant can fully bypass operator-configured per-user and per-vhost connection caps by connecting via port 5552 instead of 5672. Preconditions include rabbitmq_stream plugin enabled Authenticated stream-protocol credentials Operator relies on per-user/per-vhost connection limits for tenant isolation. This issue is fixed in versions 4.2.7 and 4.3.1.

Announced Source revision 1
Original source ↗

BIT-rabbitmq-2026-66067

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:BIT-rabbitmq-2026-66067

rabbitmq

Source reference: /affected/0/package/name

Affected versions
Not stated in this record
Fixed versions
4.2.7

Source reference: /affected/0/ranges

4.3.1

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "SEMVER",
        "events": [
          {
            "introduced": "4.2.0"
          },
          {
            "fixed": "4.2.7"
          },
          {
            "introduced": "4.3.0"
          },
          {
            "fixed": "4.3.1"
          }
        ]
      }
    ],
    "package": {
      "name": "rabbitmq",
      "purl": "pkg:bitnami/rabbitmq",
      "ecosystem": "Bitnami"
    },
    "severity": [
      {
        "type": "CVSS_V4",
        "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/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"
      }
    ],
    "database_specific": {
      "source": "https://github.com/bitnami/vulndb/tree/main/data/rabbitmq/BIT-rabbitmq-2026-66067.json"
    }
  }
]
Related CVEs
CVE-2026-66067

Source reference: /aliases

Publisher severity

medium

Source reference: /database_specific/severity

Linked CVE context

These ratings describe the referenced vulnerabilities and products. They are not a severity rating for every application using this dependency.

CVE-2026-66067 · Medium

rabbitmq-server

Event
#59599 · Revision 1
Added to Heist Feed
Publisher date
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