CVE-2026-67234

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-67234
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67234.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-67234
Aliases
Downstream
Published
2026-09-25T16:03:38Z
Modified
2026-10-21T02:59:01Z
Severity
  • 2.3 (Low) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
RabbitMQ: Non-RFC-conformant cookie name when clearing the auth-mechanism preference
Details

RabbitMQ is a messaging and streaming broker. From 4.2.0 until 4.2.8 and 4.3.2, get_auth_mechanism/1 used term_to_binary/1 on the strict_auth_mechanism or preferred_auth_mechanism atom when clearing the corresponding cookie, producing a non-ASCII cookie name that violates RFC 6265 and can prevent the browser from deleting the preference. The issue is not directly exploitable for code execution or data exfiltration; its security relevance is limited to stale authentication-mechanism preferences persisting across logout and login cycles. This issue is fixed in versions 4.2.8 and 4.3.2.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-20"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67234.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
8b611c9f4bd2d1615ef855cdf1459da3196d4d3c
Introduced
1929eeadf9b2bac12c5434fb56884ef27370580e
Fixed
a509158b1b1e21c892a7f1dacbe0d158076dc7b8
Fixed
149cb59d618cefa83c6deb02dbbb1e8a7a2bc968
Fixed
baac0aaf170efeb4f124ee36b8417274fa8dcc1a
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "4.2.0"
                },
                {
                    "fixed":  "4.2.8"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "introduced":  "4.3.0"
                },
                {
                    "fixed":  "4.3.2"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "149cb59d618cefa83c6deb02dbbb1e8a7a2bc968"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "range":  [
                {
                    "fixed":  "baac0aaf170efeb4f124ee36b8417274fa8dcc1a"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "v4.2.8",
            "range":  [
                {
                    "fixed":  "8b611c9f4bd2d1615ef855cdf1459da3196d4d3c"
                }
            ],
            "source":  "REFERENCES_TAG"
        },
        {
            "original_tag":  "v4.3.2",
            "range":  [
                {
                    "fixed":  "a509158b1b1e21c892a7f1dacbe0d158076dc7b8"
                }
            ],
            "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
v4.3.0
v4.3.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67234.json"