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LwIP TCP/IP Stack MQTT Client Application (2.0.1 - 2.2.1)

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critical advisory

Critical Out-of-Bounds Write in lwIP MQTT Client

An out-of-bounds write vulnerability (CVE-2026-87121) in the lwIP TCP/IP Stack MQTT client allows unauthenticated remote attackers to achieve full code execution on affected devices.

lwIP TCP/IP Stack MQTT Client Application