Vulnerability · Published Jan 12, 2026 · Assigned by VulnCheck

CVE-2026-22212TinyOS <= 2.1.2 Stack-Based Buffer Overflow in mcp2200gpio

Medium 4.8

In plain English

A medium-severity stack buffer overflow in TinyOS from TinyOS. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).

Severity (CVSS 4.0)4.8Medium

Exploit odds (30 days)0.1%top 96.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

TinyOS versions up to and including 2.1.2 contain a stack-based buffer overflow vulnerability in the mcp2200gpio utility. The vulnerability is caused by unsafe use of strcpy() and strcat() functions when constructing device paths during automatic device discovery. A local attacker can exploit this by creating specially crafted filenames under /dev/usb/, leading to stack memory corruption and application crashes.

Affected products (as reported)

Vendor	Product	Versions
TinyOS	TinyOS	0 – through 2.1.2

Weakness: CWE-121 · Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

References

https://seclists.org/fulldisclosure/2026/Jan/14 technical-description, exploit
https://github.com/tinyos/tinyos-main product
https://www.vulncheck.com/advisories/tinyos-stack-based-buffer-overflow-in-mcp2200gpio third-party-advisory