CVE-2026-66067

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Source
https://cve.org/CVERecord?id=CVE-2026-66067
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-66067.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-66067
Aliases
  • GHSA-hwqx-2gfg-89qf
Downstream
Published
2026-09-23T20:12:00Z
Modified
2026-09-24T11:45:19Z
Severity
  • 6.0 (Medium) CVSS_V4 - 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 CVSS Calculator
Summary
RabbitMQ: Stream protocol skips per vhost per user connection limits
Details

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.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-770"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66067.json"
}
References

Affected packages

Git / github.com/rabbitmq/rabbitmq-server

Affected ranges

Type
GIT
Repo
https://github.com/rabbitmq/rabbitmq-server
Events
Introduced
95c501fbad76c66156346cf364d158d6e30aa4d9
Fixed
b15fd2a3e5465cb6ed403d5a774ef61b1a391b89
Introduced
1929eeadf9b2bac12c5434fb56884ef27370580e
Fixed
49decca35e59d2cb774e5abd76412cee721308a5
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "4.2.0"
        },
        {
            "fixed":  "4.2.7"
        },
        {
            "introduced":  "4.3.0"
        },
        {
            "fixed":  "4.3.1"
        }
    ],
    "source":  "AFFECTED_FIELD"
}

Affected versions

v4.*
v4.2.0
v4.2.1
v4.2.2
v4.2.3
v4.2.4
v4.2.5
v4.2.6
v4.3.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-66067.json"