Vulnerability · Published Jan 12, 2026 · Assigned by VulnCheck

CVE-2026-22213RIOT OS <= 2026.01-devel-317 Stack-Based Buffer Overflow in tapslip6 Utility

Low 2.4

In plain English

A low-severity stack buffer overflow in RIOT OS from RIOT. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities).

Severity (CVSS 4.0)2.4Low

Exploit odds (30 days)0.4%top 65.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
RIOT	RIOT OS	0 – through 2026.01-devel-317

Weakness: CWE-121 · Vector: 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

References

https://seclists.org/fulldisclosure/2026/Jan/15 technical-description, exploit
https://www.riot-os.org/ product
https://github.com/RIOT-OS/RIOT product
https://www.vulncheck.com/advisories/riot-os-stack-based-buffer-overflow-in-tapslip6-utility third-party-advisory