CISA warns of critical lwIP MQTT client out-of-bounds write
CISA published ICSA-26-265-01 for a critical out-of-bounds write (CWE-787) in the lwIP TCP/IP Stack MQTT Client Application, versions 2.0.1 through 2.2.1. CVSS 3.1 base score is 9.8. Successful exploitation could allow full code execution. The fix is in lwIP commit f89407ea711879c04d91c92b35d67be78bbaf0f1; users should update via the lwIP repository.
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“Successful exploitation of this vulnerability could allow an attacker to gain full code execution on the device.”
“Users of lwIP are encouraged to update their version of lwIP using the repository found at https://savannah.nongnu.org/projects/lwip.”
Summary last validated Sep 29, 2026
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