{"id":"CVE-2026-63341","published":"2026-10-30T23:17:13.690","lastModified":"2026-10-30T23:17:13.690","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.","cvssScore":7.5,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwes":["CWE-248","CWE-400"],"vendors":[],"products":[],"references":[{"url":"https://github.com/moscajs/aedes/commit/b9024faa4cb416c4c6980760b4d7f55336315f2d","tags":[]},{"url":"https://github.com/moscajs/aedes/releases/tag/v1.1.1","tags":[]},{"url":"https://github.com/moscajs/aedes/security/advisories/GHSA-xxqp-5qx8-gj5q","tags":[]}],"exploitRefs":[{"url":"https://github.com/moscajs/aedes/commit/b9024faa4cb416c4c6980760b4d7f55336315f2d","tags":[]},{"url":"https://github.com/moscajs/aedes/releases/tag/v1.1.1","tags":[]},{"url":"https://github.com/moscajs/aedes/security/advisories/GHSA-xxqp-5qx8-gj5q","tags":[]}],"hasPoc":true,"ai":null}