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Vulnerability record · CVE-2026-93575 · published 18 September 2026

CVE-2026-93575: A flaw was found in Netty's MqttDecoder.

A flaw was found in Netty's MqttDecoder. An unauthenticated remote attacker can exploit this vulnerability by sending a specially crafted MQTT CONNECT packet. The decoder fails to properly validate the 'Properties Length' against the 'Remaining Length', allowing an attacker to bypass size limits. This leads to excessive memory and CPU consumption, resulting in a denial of service (DoS) due to an OutOfMemoryError.

7.5 CVSS 3.1 High EPSS 0.66% · top 50.2% CWE-1035 · CWE-1035 Awaiting Analysis
7.5CVSS 3.1 base score
0.66%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
25 Sep 2026Last modified by NVD

Description

A flaw was found in Netty's MqttDecoder. An unauthenticated remote attacker can exploit this vulnerability by sending a specially crafted MQTT CONNECT packet. The decoder fails to properly validate the 'Properties Length' against the 'Remaining Length', allowing an attacker to bypass size limits. This leads to excessive memory and CPU consumption, resulting in a denial of service (DoS) due to an OutOfMemoryError.

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

References

LinkTags
https://access.redhat.com/security/cve/CVE-2026-93575
https://bugzilla.redhat.com/show_bug.cgi?id=2536967

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Source: NIST National Vulnerability Database (record CVE-2026-93575), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.