CVE-2026-93575 Io.netty/netty-codec-mqtt: netty: resource exhaustion in 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...

CVE-2026-93575 Io.netty/netty-codec-mqtt: netty: resource exhaustion in 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...

Improper Neutralization

Overview Affected versions of this package are vulnerable to Improper Neutralization through the CONNECT and PUBLISH encoding paths in MqttEncoder and MqttCodecUtil. An attacker can send MQTT fields containing NUL bytes or wildcard characters by supplying crafted client identifiers, usernames, wi...

Allocation of Resources Without Limits or Throttling

Overview Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling due to the lack of size limits applied to the Properties section during the decoding process. An attacker can cause excessive CPU and memory consumption by sending MQTT messages with...