Buffer Overflow Vulnerability in RIOT OS for IoT Devices

CVE-2026-27703

What is CVE-2026-27703?

A buffer overflow vulnerability exists in RIOT, an open-source microcontroller operating system designed for IoT devices. The issue arises from the coap_well_known_core_default_handler, which improperly handles user-provided option data by writing into a fixed-size buffer without verifying its adequate capacity. This flaw can lead to the corruption of adjacent stack locations, potentially affecting critical security components, such as return addresses. Exploiting this vulnerability may result in service denial or arbitrary code execution, posing significant risks to systems relying on this software.

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