What’s Vulnerable › Vulnerabilities

CVE-2026-22211: TinyOS <= 2.1.2 Global Buffer Overflow in printfUART

• Severity: medium (CVSS 5.1 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-01-14 · updated 2026-07-14
• Weakness: CWE-787

Description

TinyOS versions up to and including 2.1.2 contain a global buffer overflow vulnerability in the printfUART formatted output implementation used within the ZigBee / IEEE 802.15.4 networking stack. The implementation formats output into a fixed-size global buffer and concatenates strings for %s format specifiers using strcat() without verifying remaining buffer capacity. When printfUART is invoked with a caller-controlled string longer than the available space, the unbounded sprintf/strcat sequence writes past the end of debugbuf, resulting in global memory corruption. This can cause denial of service, unintended behavior, or information disclosure via corrupted adjacent global state or UART output.

Affected products

• TinyOS: through 2.1.2

References

• https://github.com/tinyos/tinyos-main
• https://seclists.org/fulldisclosure/2026/Jan/14
• https://www.vulncheck.com/advisories/tinyos-global-buffer-overflow-in-printfuart

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