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Vulnerability record · CVE-2026-22213 · published 12 January 2026

CVE-2026-22213: Riot-os riot stack-based buffer overflow vulnerability

Riot Os · Riot

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.

2.4 CVSS 4.0 Low EPSS 0.40% · top 67.2% CWE-121 · Stack-based buffer overflow
2.4CVSS 4.0 base score
0.40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 1 tagged exploit
14 Jul 2026Last modified by NVD

Description

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.

CVSS: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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/RIOT-OS/RIOT Product
https://seclists.org/fulldisclosure/2026/Jan/15 ExploitMailing ListThird Party Advisory
https://www.riot-os.org/ Product
https://www.vulncheck.com/advisories/riot-os-stack-based-buffer-overflow-in-tapslip6-utility Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-27703Riot-os riot out-of-bounds write vulnerabilityRIOT is an open-source microcontroller operating system, designed to match the requirements of Internet of Things (IoT) devices and other embedded de…EPSS 0.62%9.8CVE-2023-33975Riot-os riot memory buffer overflow vulnerabilityRIOT-OS, an operating system for Internet of Things (IoT) devices, contains a network stack with the ability to process 6LoWPAN frames. In version 20…EPSS 1.5%9.8CVE-2023-24823Riot-os riot out-of-bounds write vulnerabilityRIOT-OS, an operating system that supports Internet of Things devices, contains a network stack with the ability to process 6LoWPAN frames. Prior to …EPSS 0.99%9.8CVE-2023-24819Riot-os riot out-of-bounds write vulnerabilityRIOT-OS, an operating system that supports Internet of Things devices, contains a network stack with the ability to process 6LoWPAN frames. Prior to …EPSS 0.99%9.8CVE-2021-27427Riot-os riot integer overflow vulnerabilityRIOT OS version 2020.01.1 is vulnerable to integer wrap-around in its implementation of calloc function, which can lead to arbitrary memory allocatio…EPSS 1.7%9.8CVE-2021-27357Riot-os riot classic buffer overflow vulnerabilityRIOT-OS 2020.01 contains a buffer overflow vulnerability in /sys/net/gnrc/routing/rpl/gnrc_rpl_control_messages.c.EPSS 1.2%9.8CVE-2021-27698Riot-os riot classic buffer overflow vulnerabilityRIOT-OS 2021.01 contains a buffer overflow vulnerability in /sys/net/gnrc/routing/rpl/gnrc_rpl_control_messages.c through the _parse_options() functi…EPSS 1.2%9.8CVE-2021-27697Riot-os riot classic buffer overflow vulnerabilityRIOT-OS 2021.01 contains a buffer overflow vulnerability in sys/net/gnrc/routing/rpl/gnrc_rpl_validation.c through the gnrc_rpl_validation_options() …EPSS 1.3%

Source: NIST National Vulnerability Database (record CVE-2026-22213), CISA KEV, FIRST EPSS (scores of 2026-10-14). This page is refreshed as NVD updates the record.