{"schema":"threatline.record/2","record":{"id":"CVE-2026-67409","aliases":["GHSA-qw3h-qqm9-jrw8"],"summary":"RabbitMQ: JWKS Fetch Ignores HTTP Response Status Code - Signing Key Destruction Causes Authentication DoS","details":"RabbitMQ is a messaging and streaming broker. From 3.13.0 until 4.3.3, 4.2.9, 4.1.14, 4.0.23, and 3.13.18, JWKS Fetch Ignores HTTP Response Status Code - Signing Key Destruction Causes Authentication DoS (CWE-252). the JWKS key fetching mechanism in uaajwt.erl does not validate the HTTP response status code when downloading signing keys from the OAuth2 provider's JWKS endpoint. Non-200 responses (including 4xx and 5xx errors) are processed identically to successful responses. When the JWKS endpoint returns an error response with a valid-JSON body that lacks a keys field, all previously cached signing keys are destroyed, causing a persistent authentication denial of Files: deps/rabbitmqauthbackendoauth2/src/uaajwt.erl, lines 50-63 deps/rabbitmqauthbackendoauth2/src/uaajwks.erl, lines 5-7 deps/rabbitmqauthbackendoauth2/src/rabbitoauth2provider.erl, lines 98-107 Bug 1: HTTP status code ignored (uaajwt.erl:50-63): The Erlang httpc module returns {ok, {{HttpVersion, StatusCode, ReasonPhrase}, Headers, Body}}. The pattern {ok, {, , JwksBody}} matches ANY successful HTTP transaction Persistent authentication DoS: Once keys are destroyed, ALL OAuth2/JWT authentication fails for all users until a new successful JWKS refresh occurs Amplification: A single attacker can deny access to all legitimate OAuth2 users across the entire RabbitMQ. This issue is fixed in versions 4.3.3, 4.2.9, 4.1.14, 4.0.23, and 3.13.18.","categories":["Unclassified"],"product":"rabbitmq-server","vendor":"rabbitmq","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-67409","source_modified_at":"2026-09-25T17:49:48.064Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"rabbitmq-server","vendor":"rabbitmq","versions":[{"status":"affected","version":">= 4.3.0, < 4.3.3"},{"status":"affected","version":">= 4.2.0, < 4.2.9"},{"status":"affected","version":">= 4.1.0, < 4.1.14"},{"status":"affected","version":">= 4.0.0, < 4.0.23"},{"status":"affected","version":">= 3.13.0, < 3.13.18"}],"defaultStatus":null},{"source":"GitHub Advisory Database","source_url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-qw3h-qqm9-jrw8","source_modified_at":"2026-07-29T15:10:16Z","fetched_at":"2026-10-23T18:58:35.272684Z","package":{"ecosystem":"rabbitmq","name":"rabbitmq-server"},"range":">= 4.3.0, < 4.3.3"},{"source":"GitHub Advisory Database","source_url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-qw3h-qqm9-jrw8","source_modified_at":"2026-07-29T15:10:16Z","fetched_at":"2026-10-23T18:58:35.272684Z","package":{"ecosystem":"rabbitmq","name":"rabbitmq-server"},"range":">= 4.2.0, < 4.2.9"},{"source":"GitHub Advisory Database","source_url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-qw3h-qqm9-jrw8","source_modified_at":"2026-07-29T15:10:16Z","fetched_at":"2026-10-23T18:58:35.272684Z","package":{"ecosystem":"rabbitmq","name":"rabbitmq-server"},"range":">= 4.1.0, < 4.1.14"},{"source":"GitHub Advisory Database","source_url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-qw3h-qqm9-jrw8","source_modified_at":"2026-07-29T15:10:16Z","fetched_at":"2026-10-23T18:58:35.272684Z","package":{"ecosystem":"rabbitmq","name":"rabbitmq-server"},"range":">= 4.0.0, < 4.0.23"},{"source":"GitHub Advisory Database","source_url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-qw3h-qqm9-jrw8","source_modified_at":"2026-07-29T15:10:16Z","fetched_at":"2026-10-23T18:58:35.272684Z","package":{"ecosystem":"rabbitmq","name":"rabbitmq-server"},"range":">= 3.13.0, < 3.13.18"}],"fixed_versions":[{"source":"GitHub Advisory Database","source_url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-qw3h-qqm9-jrw8","source_modified_at":"2026-07-29T15:10:16Z","fetched_at":"2026-10-23T18:58:35.272684Z","package":{"ecosystem":"rabbitmq","name":"rabbitmq-server"},"version":"4.3.3"},{"source":"GitHub Advisory Database","source_url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-qw3h-qqm9-jrw8","source_modified_at":"2026-07-29T15:10:16Z","fetched_at":"2026-10-23T18:58:35.272684Z","package":{"ecosystem":"rabbitmq","name":"rabbitmq-server"},"version":"4.2.9"},{"source":"GitHub Advisory Database","source_url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-qw3h-qqm9-jrw8","source_modified_at":"2026-07-29T15:10:16Z","fetched_at":"2026-10-23T18:58:35.272684Z","package":{"ecosystem":"rabbitmq","name":"rabbitmq-server"},"version":"4.1.14"},{"source":"GitHub Advisory Database","source_url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-qw3h-qqm9-jrw8","source_modified_at":"2026-07-29T15:10:16Z","fetched_at":"2026-10-23T18:58:35.272684Z","package":{"ecosystem":"rabbitmq","name":"rabbitmq-server"},"version":"4.0.23"},{"source":"GitHub Advisory 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Database","url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-qw3h-qqm9-jrw8","fetched_at":"2026-10-23T18:58:35.272684Z","source_modified_at":"2026-07-29T15:10:16Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-67409","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","GitHub Advisory Database","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-qw3h-qqm9-jrw8","tags":["exploit"]},{"source":"CVE List","url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"poc","automatable":"no","technical_impact":"partial","assessed_at":"2026-09-25T17:49:17.770463Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-09-25T17:49:48.064Z","content_hash":"1a11ca3e30b7199cc0e56791d82a93c528e7893938b949be1fd92afe91132f9f"}}