Buffer Overflow Affecting arduino/ArduinoCore-avr package, versions [,1.8.7)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-ARDUINOARDUINOCOREAVR-15091536
- published25 Jan 2026
- disclosed21 Jan 2026
- creditMaxime Rossi Bellom, Ramtine Tofighi Shirazi
Introduced: 21 Jan 2026
CVE-2025-69209 (opens in a new tab)How to fix?
Upgrade arduino/ArduinoCore-avr to version 1.8.7 or higher.
Overview
Affected versions of this package are vulnerable to Buffer Overflow due to the dtostrf function, which writes beyond fixed-size stack buffers. An attacker can cause memory corruption, denial of service, or potentially execute arbitrary code by passing excessively large values to the decimalPlaces parameter in certain string conversion operations.