Vulnerability Description
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.
Related Weaknesses (CWE)
References
- https://github.com/arduino/ArduinoCore-avr/pull/622/changes/9492e146880d2b05d9cb
- https://github.com/arduino/ArduinoCore-avr/releases/tag/1.8.8
- https://github.com/arduino/ArduinoCore-avr/security/advisories/GHSA-fhp2-f8hw-mg
FAQ
What is CVE-2026-48490?
CVE-2026-48490 is a documented vulnerability. 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 overf...
How severe is CVE-2026-48490?
CVSS scoring is not yet available for CVE-2026-48490. Check NVD for updates.
Is there a patch for CVE-2026-48490?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.