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Response snapshot Oct 31, 2026, 01:26 UTC

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VulnerabilityCVE-2026-63341

Aedes is an MQTT broker that can run on any stream server.

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.

At a glance

Exploited
Not known
Severity
7.5 High (CVSS 3.1)
Chance of exploitation
Not estimated
Sources
1 source

What to do

Check the vendor advisory for affected versions and fixes.

Read NVD CVE-2026-63341 (opens a new tab)

What happened

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.

Scores and how they were measured

CVSS base severity

7.5

Version 3.1As of

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

Not available

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Sources

  1. Primary source

    NVD CVE-2026-63341 (opens a new tab)

    NVD record: description, CVSS (the CNA score is preferred), affected products, and publication date. Not evidence of exploitation.

    Published Checked

  2. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  3. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  4. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 30). Aedes is an MQTT broker that can run on any stream server. (CVE-2026-63341). https://kevwire.com/record/CVE-2026-63341

MLA

"Aedes is an MQTT broker that can run on any stream server. (CVE-2026-63341)." KEVWire, 30 Oct. 2026, kevwire.com/record/CVE-2026-63341.

Chicago

KEVWire. "Aedes is an MQTT broker that can run on any stream server. (CVE-2026-63341)." Last modified October 30, 2026. https://kevwire.com/record/CVE-2026-63341.

Evidence summary (plain text)

Aedes is an MQTT broker that can run on any stream server. (Oct 30, 2026).
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.
CVSS 7.5 (version 3.1; evidence as of Oct 30, 2026; https://nvd.nist.gov/vuln/detail/CVE-2026-63341).
Sources:
NVD CVE-2026-63341: https://nvd.nist.gov/vuln/detail/CVE-2026-63341
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-30T23:16:04.425Z&lastModEndDate=2026-10-31T00:50:55.911Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-30T22:40:58.681Z&lastModEndDate=2026-10-31T00:15:58.432Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-30T22:05:59.313Z&lastModEndDate=2026-10-30T23:40:58.124Z&resultsPerPage=500&startIndex=0
Record ID: CVE-2026-63341.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 31, 2026, 00:50 UTC. Ingestion is not an independent editorial investigation.

NVD status: Received. Publication in the NVD is not evidence of exploitation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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Record details

Record detail