What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-01-12 · updated 2026-07-14
• Weakness: CWE-121

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

• RIOT-OS RIOT: before 2025.10; 2026.01-devel, 2026.01-rc1 — fixed in 2025.10

How to fix

Upgrade to a fixed version: RIOT-OS RIOT 2025.10. Check the vendor advisory for mitigations.

References

• https://github.com/RIOT-OS/RIOT
• https://seclists.org/fulldisclosure/2026/Jan/15
• https://www.riot-os.org/
• https://www.vulncheck.com/advisories/riot-os-stack-based-buffer-overflow-in-tapslip6-utility

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