Moscajs Aedes up to 1.1.0 Topic Parsing lib/qlobber.js qlobber._split_words resource consumption

Summaryinfo

A vulnerability classified as problematic was found in Moscajs Aedes up to 1.1.0. The impacted element is the function qlobber._split_words of the file lib/qlobber.js of the component Topic Parsing. Executing a manipulation can lead to resource consumption. This vulnerability is handled as CVE-2026-63341. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic was found in Moscajs Aedes up to 1.1.0. This vulnerability affects the function qlobber._split_words of the file lib/qlobber.js of the component Topic Parsing. The manipulation with an unknown input leads to a resource consumption vulnerability. The CWE definition for the vulnerability is CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. As an impact it is known to affect availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-63341 since 07/16/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 1.1.1 eliminates this vulnerability.

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Productinfo

Vendor

• Moscajs

Name

• Aedes

Version

• 1.0
• 1.1.0

Website

• Product: https://github.com/moscajs/aedes/

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