CVE-2026-93575 PUBLISHED

Io.netty/netty-codec-mqtt: netty: resource exhaustion in mqttdecoder

Assigner: redhat
Reserved: 18.09.2026 Published: 18.09.2026 Updated: 18.09.2026

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.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS Score: 7.5

Product Status

Vendor Red Hat
Product Red Hat AMQ Broker 7
Versions Default: affected
Vendor Red Hat
Product Red Hat build of Apache Camel for Spring Boot 4
Versions Default: affected
Vendor Red Hat
Product Red Hat Fuse 7
Versions Default: affected
Vendor Red Hat
Product Red Hat JBoss Enterprise Application Platform 7
Versions Default: affected
Vendor Red Hat
Product Red Hat JBoss Enterprise Application Platform 7
Versions Default: affected
Vendor Red Hat
Product Red Hat JBoss Enterprise Application Platform 7
Versions Default: affected
Vendor Red Hat
Product Red Hat JBoss Enterprise Application Platform 7
Versions Default: affected
Vendor Red Hat
Product Red Hat Single Sign-On 7
Versions Default: affected

Workarounds

See https://github.com/netty/netty/security/advisories/GHSA-jqf3-r9ww-c5x8 for fixed versions and remediation guidance.

References

Problem Types

  • CWE-1035 CWE