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.

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History

Mon, 14 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Sun, 13 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
First Time appeared Arduino
Arduino arduinocore-avr
Vendors & Products Arduino
Arduino arduinocore-avr

Fri, 11 Sep 2026 23:45:00 +0000

Type Values Removed Values Added
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.
Title ArduinoCore-AVR: Stack-Based Buffer Overflow in String float/double concatenation handler
Weaknesses CWE-120
References
Metrics cvssV4_0

{'score': 6.9, 'vector': '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'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-09-14T18:17:38.993Z

Reserved: 2026-05-21T15:33:08.291Z

Link: CVE-2026-48490

cve-icon Vulnrichment

Updated: 2026-09-14T17:06:23.978Z

cve-icon NVD

Status : Received

Published: 2026-09-11T21:17:10.100

Modified: 2026-09-14T19:17:23.083

Link: CVE-2026-48490

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-15T20:15:14Z

Weaknesses