CVE-2026-67407

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Source
https://cve.org/CVERecord?id=CVE-2026-67407
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67407.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-67407
Aliases
  • GHSA-q46v-hrvq-hp24
Downstream
Published
2026-09-25T16:30:35Z
Modified
2026-09-26T03:46:53Z
Severity
  • 5.1 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:H/SA:N CVSS Calculator
Summary
RabbitMQ: Incomplete fix for CVE-2026-44838: `escape_regex_char/1` does not escape `-`, leaving room for an MQTT topic permission bypass
Details

RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.3.3 and 4.2.9 and 4.1.14 and 4.0.23, Incomplete fix for CVE-2026-44838: escaperegexchar/1 does not escape -, leaving room for an MQTT topic permission bypass. the CVE-2026-44838 fix made expandtopicpermission/2 escape regex metacharacters in expanded topic-permission variables (escaperegex(V)), but escaperegexchar/1 escapes \ ^ $ . | ? + ( ) [ ] { } and omits -. When a topic permission template places {clientid} inside a [...] character class A low-privileged authenticated MQTT user controlling its clientid can broaden topic authorization (read and write) when templates embed {clientid} in a [...] This issue is fixed in versions 4.3.3 and 4.2.9 and 4.1.14 and 4.0.23.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-862"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67407.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "introduced":  "4.1.0"
                },
                {
                    "fixed":  "4.1.14"
                },
                {
                    "introduced":  "4.0.0"
                },
                {
                    "fixed":  "4.0.23"
                }
            ],
            "source":  "AFFECTED_FIELD"
        }
    ]
}
References

Affected packages

Git / github.com/rabbitmq/rabbitmq-server

Affected ranges

Type
GIT
Repo
https://github.com/rabbitmq/rabbitmq-server
Events
Introduced
a509158b1b1e21c892a7f1dacbe0d158076dc7b8
Fixed
1d284b2d2a1e2f845ad22b0d5ee38ec372d50802
Introduced
95c501fbad76c66156346cf364d158d6e30aa4d9
Fixed
47d6d6457c7d1a440daed643cb7d76bba313e79c
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "4.3.2"
        },
        {
            "fixed":  "4.3.3"
        },
        {
            "introduced":  "4.2.0"
        },
        {
            "fixed":  "4.2.9"
        }
    ],
    "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
v4.2.7
v4.2.8
v4.3.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67407.json"