CVE-2026-48490
MediumCVSS 6.9Exploitation Probability (EPSS)
Elevated risk50th percentile - higher than 50% of all known CVEs
Summary
ArduinoCore-avr versions prior to 1.8.8 allow an attacker to trigger a stack-based buffer overflow when concatenating floating-point values of sufficiently large magnitude onto an Arduino String object. Passing values near the extremes of the float or double range to String::concat(float), String::concat(double), String::operator+=(), or the + operator causes dtostrf() to write beyond the stack buffer, leading to memory corruption and denial of service.
Risk Assessment
It can lead to memory corruption and denial of service, and under specific conditions to arbitrary code execution on AVR-based Arduino boards. The risk affects embedded systems using these boards.
Recommendation
Update ArduinoCore-avr to version 1.8.8 or later. Avoid passing extreme floating-point values to String objects.
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Original NVD description (English source)
ArduinoCore-avr contains the source code and configuration files of the Arduino AVR Boards platform. A vulnerability in versions prior to 1.8.8 allows an attacker to trigger a stack-based buffer overflow when concatenating floating-point values of sufficiently large magnitude onto an Arduino String object. By passing values near the extremes of the float or double range to `String::concat(float)`, `String::concat(double)`, `String::operator+=()`, or the `+` operator with a float/double operand, `dtostrf()` writes beyond the fixed-size stack buffer, causing memory corruption and denial of service. Under specific conditions, this could enable arbitrary code execution on AVR-based Arduino boards. The fix is included starting from the `1.8.8 `release.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS