{"affected":[{"affectedData":[{"product":"aedes","vendor":"moscajs","versions":[{"status":"affected","version":"< 1.1.1"}]}],"source":"security-advisories@github.com"}],"cveTags":[],"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."}],"id":"CVE-2026-63341","lastModified":"2026-11-05T03:17:30.707","metrics":{"cvssMetricV31":[{"cvssData":{"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"},"exploitabilityScore":3.9,"impactScore":3.6,"source":"security-advisories@github.com","type":"Secondary"}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"id":"CVE-2026-63341","options":[{"exploitation":"poc"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","timestamp":"2026-11-05T02:56:48.899765Z","version":"2.0.3"}}]},"published":"2026-10-30T23:17:13.690","references":[{"source":"security-advisories@github.com","url":"https://github.com/moscajs/aedes/commit/b9024faa4cb416c4c6980760b4d7f55336315f2d"},{"source":"security-advisories@github.com","url":"https://github.com/moscajs/aedes/releases/tag/v1.1.1"},{"source":"security-advisories@github.com","url":"https://github.com/moscajs/aedes/security/advisories/GHSA-xxqp-5qx8-gj5q"},{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","url":"https://github.com/moscajs/aedes/security/advisories/GHSA-xxqp-5qx8-gj5q"}],"sourceIdentifier":"security-advisories@github.com","vulnStatus":"Deferred","weaknesses":[{"description":[{"lang":"en","value":"CWE-248"},{"lang":"en","value":"CWE-400"}],"source":"security-advisories@github.com","type":"Secondary"}]}