CVE-2026-22213: Riot-OS Riot

Critical severity, CVSS 9.8. EPSS: 0.4% chance of exploitation in the next 30 days.

RIOT OS versions up to and including 2026.01-devel-317 contain a stack-based buffer overflow vulnerability in the tapslip6 utility. The vulnerability is caused by unsafe string concatenation in the devopen() function, which constructs a device path using unbounded user-controlled input. The utility uses strcpy() and strcat() to concatenate the fixed prefix '/dev/' with a user-supplied device name provided via the -s command-line option without bounds checking. This allows an attacker to supply an excessively long device name and overflow a fixed-size stack buffer, leading to process crashes and memory corruption.

Affected products

• Riot-OS Riot: before 2025.10 (fixed in 2025.10); version 2026.01 only

Published 2026-01-12. Last modified 2026-07-14.