CVE-2026-67407

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-67407
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-67407.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-67407
Aliases
Downstream
Published
2026-09-25T16:30:35Z
Modified
2026-10-22T10:35:21Z
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": [
                {
                    "range": [
                        {
                            "introduced": "4.1.0"
                        },
                        {
                            "fixed": "4.1.14"
                        },
                        {
                            "introduced": "4.0.0"
                        },
                        {
                            "fixed": "4.0.23"
                        }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                }
            ]
        }
    ]
}
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": [
        {
            "range": [
                {
                    "introduced": "4.3.2"
                },
                {
                    "fixed": "4.3.3"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "introduced": "4.2.0"
                },
                {
                    "fixed": "4.2.9"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "original_tag": "v4.2.9",
            "range": [
                {
                    "fixed": "47d6d6457c7d1a440daed643cb7d76bba313e79c"
                }
            ],
            "source": "REFERENCES_TAG"
        },
        {
            "original_tag": "v4.3.3",
            "range": [
                {
                    "fixed": "1d284b2d2a1e2f845ad22b0d5ee38ec372d50802"
                }
            ],
            "source": "REFERENCES_TAG"
        }
    ]
}

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/osv-test-cve-osv-conversion/osv-output/CVE-2026-67407.json"