CVE-2026-22211 TinyOS <= 2.1.2 Global Buffer Overflow in printfUART
Attacker can trigger global buffer overflow in TinyOS printfUART, causing denial of service or information disclosure in ZigBee networks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-22211?
CVE-2026-22211 is a medium-severity memory corruption vulnerability in TinyOS, published on 14 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-787
Which versions are affected by CVE-2026-22211?
How do I fix CVE-2026-22211?
No fix has been published for CVE-2026-22211 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-22211 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-22211 exists.
Sources
Also known as GHSA-hwxm-rgw2-8633.