{"id":"CVE-2026-67234","published":"2026-09-25T17:17:11.743","lastModified":"2026-09-28T14:38:38.163","description":"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.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":["CWE-20"],"vendors":[],"products":[],"references":[{"url":"https://github.com/rabbitmq/rabbitmq-server/commit/149cb59d618cefa83c6deb02dbbb1e8a7a2bc968","tags":[]},{"url":"https://github.com/rabbitmq/rabbitmq-server/commit/baac0aaf170efeb4f124ee36b8417274fa8dcc1a","tags":[]},{"url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.8","tags":[]},{"url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.2","tags":[]},{"url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-q286-p3m9-j69f","tags":[]}],"exploitRefs":[{"url":"https://github.com/rabbitmq/rabbitmq-server/commit/149cb59d618cefa83c6deb02dbbb1e8a7a2bc968","tags":[]},{"url":"https://github.com/rabbitmq/rabbitmq-server/commit/baac0aaf170efeb4f124ee36b8417274fa8dcc1a","tags":[]},{"url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.8","tags":[]},{"url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.2","tags":[]},{"url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-q286-p3m9-j69f","tags":[]}],"hasPoc":true,"ai":null}