{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-67234","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-07-28T19:50:39.438Z","datePublished":"2026-09-25T16:03:38.161Z","dateUpdated":"2026-09-25T19:53:58.560Z"},"containers":{"cna":{"title":"RabbitMQ: Non-RFC-conformant cookie name when clearing the auth-mechanism preference","problemTypes":[{"descriptions":[{"cweId":"CWE-20","lang":"en","description":"CWE-20: Improper Input Validation","type":"CWE"}]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":2.3,"baseSeverity":"LOW","vectorString":"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","version":"4.0"}}],"references":[{"name":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-q286-p3m9-j69f","tags":["x_refsource_CONFIRM"],"url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-q286-p3m9-j69f"},{"name":"https://github.com/rabbitmq/rabbitmq-server/commit/149cb59d618cefa83c6deb02dbbb1e8a7a2bc968","tags":["x_refsource_MISC"],"url":"https://github.com/rabbitmq/rabbitmq-server/commit/149cb59d618cefa83c6deb02dbbb1e8a7a2bc968"},{"name":"https://github.com/rabbitmq/rabbitmq-server/commit/baac0aaf170efeb4f124ee36b8417274fa8dcc1a","tags":["x_refsource_MISC"],"url":"https://github.com/rabbitmq/rabbitmq-server/commit/baac0aaf170efeb4f124ee36b8417274fa8dcc1a"},{"name":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.8","tags":["x_refsource_MISC"],"url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.8"},{"name":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.2","tags":["x_refsource_MISC"],"url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.2"}],"affected":[{"vendor":"rabbitmq","product":"rabbitmq-server","versions":[{"version":">= 4.2.0, < 4.2.8","status":"affected"},{"version":">= 4.3.0, < 4.3.2","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-25T16:03:38.161Z"},"descriptions":[{"lang":"en","value":"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."}],"source":{"advisory":"GHSA-q286-p3m9-j69f","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-25T19:53:50.305307Z","id":"CVE-2026-67234","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-25T19:53:58.560Z"}}]}}