# CVE-2026-63341: Aedes has Uncaught Exception and Uncontrolled Resource Consumption

Status: published. Published: 2026-10-30. Updated: 2026-11-05.

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.

## Remediation

- fix: aedes (npm): GitHub reports patched versions 1.1.1. Check the advisory for the affected release branch. (source: GitHub GHSA-xxqp-5qx8-gj5q) — https://github.com/moscajs/aedes/security/advisories/GHSA-xxqp-5qx8-gj5q

## Affected products and versions

- moscajs / aedes: < 1.1.1 (affected). Source: CNA: GitHub_M
-  / aedes (aedes): <= 1.1.0 (affected, GitHub advisory range). Source: GitHub GHSA-xxqp-5qx8-gj5q

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: GitHub_M

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: NVD: security-advisories@github.com

- CISA KEV: No listing in collected sources

- EPSS: 0.36% as of 2026-11-04; percentile 30.46%

- SSVC: exploitation poc; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-248, CWE-400

## Exploit evidence

- exploit: https://github.com/moscajs/aedes/security/advisories/GHSA-xxqp-5qx8-gj5q (ADP: CISA-ADP)

## References

- https://github.com/moscajs/aedes/security/advisories/GHSA-xxqp-5qx8-gj5q (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/moscajs/aedes/commit/b9024faa4cb416c4c6980760b4d7f55336315f2d (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/moscajs/aedes/releases/tag/v1.1.1 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/moscajs/aedes/security/advisories/GHSA-xxqp-5qx8-gj5q (ADP: CISA-ADP; exploit)

- https://github.com/moscajs/aedes/commit/b9024faa4cb416c4c6980760b4d7f55336315f2d (security-advisories@github.com)

- https://github.com/moscajs/aedes/releases/tag/v1.1.1 (security-advisories@github.com)

- https://github.com/moscajs/aedes/security/advisories/GHSA-xxqp-5qx8-gj5q (security-advisories@github.com)

- https://github.com/moscajs/aedes/security/advisories/GHSA-xxqp-5qx8-gj5q (GitHub Security Advisories; advisory)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-63341; retrieved 2026-11-05; source updated 2026-11-05

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-63341; retrieved 2026-11-03; source updated 2026-11-02

- GitHub Security Advisories: https://github.com/moscajs/aedes/security/advisories/GHSA-xxqp-5qx8-gj5q; retrieved 2026-11-04; source updated 2026-07-16

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-63341; retrieved 2026-11-05; source updated Not reported

Revision: 6cdfa7b470c43c7b7ff708ffd2584068bbd7df611e1f382d842a954b65d83fea

Canonical: https://y2.dev/cve/CVE-2026-63341

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