CVE-2026-22213

RIOT OS <= 2026.01-devel-317 Stack-Based Buffer Overflow in tapslip6 Utility

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

RIOT · RIOT OS

CVSS v4.0 VULNCHECK

2.4 LOWCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 NVD

9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.40% chance of exploitation in the next 30 days, 33rd percentile

Published

2026-01-12

Updated

2026-07-14

Proof-of-concept exploits (1)

• https://seclists.org/fulldisclosure/2026/Jan/15

Security advisories

• https://www.vulncheck.com/advisories/riot-os-stack-based-buffer-overflow-in-tapslip6-util…
• RIOT-OS/RIOT
• https://www.riot-os.org

References

• CVE Record
• NVD entry