{"id":"CVE-2026-48490","title":"ArduinoCore-avr contains the source code and configuration files of the Arduino AVR Boards platform","summary":"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…","severity":"medium","cvss":6.9,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","cwe":["CWE-120"],"vendor":"arduino","product":"ArduinoCore-avr","affected":["ArduinoCore-avr < 1.8.8"],"published":"2026-09-11","updated":"2026-09-14","sourceUpdated":"2026-09-14T19:17:23.083","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-48490","references":[{"url":"https://github.com/arduino/ArduinoCore-avr/pull/622/changes/9492e146880d2b05d9cb9191f1bfb2c872a48404","label":"security-advisories@github.com"},{"url":"https://github.com/arduino/ArduinoCore-avr/releases/tag/1.8.8","label":"security-advisories@github.com"},{"url":"https://github.com/arduino/ArduinoCore-avr/security/advisories/GHSA-fhp2-f8hw-mgpj","label":"security-advisories@github.com"}],"tags":["nvd","cve.org"],"epss":0.00392,"epssPercentile":0.33158,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-14T17:06:22.605242Z"},"cvssSource":"cna","ingestedAt":"2026-09-14T11:11:19.879Z","slug":"CVE-2026-48490","body":"## Overview\n\nArduinoCore-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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":38,"depthScoreParts":{"impact":38,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}