{"id":"CVE-2026-63341","state":"PUBLISHED","title":"Aedes has Uncaught Exception and Uncontrolled Resource Consumption","description":"Aedes is an MQTT broker that can run on any stream server. Prior to 1.1.1, the MQTT broker does not bound topic depth or structural complexity before passing topics through `mqemitter` into `qlobber`. A `PUBLISH`, `SUBSCRIBE`, or registered `Will` message containing an excessively deep topic can reach `qlobber._split_words` in `lib/qlobber.js` and trigger an uncaught `too many words` exception. Calls from `handlers/subscribe.js` and the publishing logic are not protected against that exception, so it escapes to the `Node.js event loop` and terminates the entire broker. The `Will` path is independently reachable when a client disconnects ungracefully: it calls `broker.publish` directly and bypasses the `PUBLISH` handler. An attacker must be able to establish an `MQTT session`, authenticated or unauthenticated according to broker configuration. A successful attack disconnects all legitimate clients and prevents reconnection until the broker process restarts. This issue is fixed in version 1.1.1.","publishedAt":"2026-10-30T22:09:50.280Z","updatedAt":"2026-10-30T22:09:50.280Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["moscajs aedes"],"affected":[{"vendor":"moscajs","product":"aedes","versions":[{"version":"< 1.1.1","status":"affected"}]}],"references":["https://github.com/moscajs/aedes/security/advisories/GHSA-xxqp-5qx8-gj5q","https://github.com/moscajs/aedes/commit/b9024faa4cb416c4c6980760b4d7f55336315f2d","https://github.com/moscajs/aedes/releases/tag/v1.1.1"],"weaknesses":["CWE-248","CWE-400"],"ingestedAt":"2026-10-30T22:16:06.501Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/63xxx/CVE-2026-63341.json","commit":"226652b7321cd45ef01add6f464a8114b52515e5","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-63341","state":"PUBLISHED","datePublished":"2026-10-30T22:09:50.280Z","dateUpdated":"2026-10-30T22:09:50.280Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-07-16T14:14:24.385Z"},"containers":{"cna":{"title":"Aedes has Uncaught Exception and Uncontrolled Resource Consumption","descriptions":[{"lang":"en","value":"Aedes is an MQTT broker that can run on any stream server. Prior to 1.1.1, the MQTT broker does not bound topic depth or structural complexity before passing topics through `mqemitter` into `qlobber`. A `PUBLISH`, `SUBSCRIBE`, or registered `Will` message containing an excessively deep topic can reach `qlobber._split_words` in `lib/qlobber.js` and trigger an uncaught `too many words` exception. Calls from `handlers/subscribe.js` and the publishing logic are not protected against that exception, so it escapes to the `Node.js event loop` and terminates the entire broker. The `Will` path is independently reachable when a client disconnects ungracefully: it calls `broker.publish` directly and bypasses the `PUBLISH` handler. An attacker must be able to establish an `MQTT session`, authenticated or unauthenticated according to broker configuration. A successful attack disconnects all legitimate clients and prevents reconnection until the broker process restarts. This issue is fixed in version 1.1.1."}],"affected":[{"vendor":"moscajs","product":"aedes","versions":[{"version":"< 1.1.1","status":"affected"}]}],"references":[{"url":"https://github.com/moscajs/aedes/security/advisories/GHSA-xxqp-5qx8-gj5q","name":"https://github.com/moscajs/aedes/security/advisories/GHSA-xxqp-5qx8-gj5q","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/moscajs/aedes/commit/b9024faa4cb416c4c6980760b4d7f55336315f2d","name":"https://github.com/moscajs/aedes/commit/b9024faa4cb416c4c6980760b4d7f55336315f2d","tags":["x_refsource_MISC"]},{"url":"https://github.com/moscajs/aedes/releases/tag/v1.1.1","name":"https://github.com/moscajs/aedes/releases/tag/v1.1.1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-248","lang":"en","description":"CWE-248: Uncaught Exception","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-400","lang":"en","description":"CWE-400: Uncontrolled Resource Consumption","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-30T22:09:50.280Z"},"source":{"advisory":"GHSA-xxqp-5qx8-gj5q","discovery":"UNKNOWN"}}}}}