CVE-2026-22214
Severity CVSS v4.0:
MEDIUM
Type:
CWE-121
Stack-based Buffer Overflow
Publication date:
12/01/2026
Last modified:
12/01/2026
Description
RIOT OS versions up to and including 2026.01-devel-317 contain a stack-based buffer overflow vulnerability in the ethos utility due to missing bounds checking when processing incoming serial frame data. The vulnerability occurs in the _handle_char() function, where incoming frame bytes are appended to a fixed-size stack buffer without verifying that the current write index remains within bounds. An attacker capable of sending crafted serial or TCP-framed input can cause the current write index to exceed the buffer size, resulting in a write past the end of the stack buffer. This condition leads to memory corruption and application crash.
Impact
Base Score 4.0
6.80
Severity 4.0
MEDIUM