ArduinoCore-avr has Stack-Based Buffer Overflow in WString Float/Double Constructors
Summary
ArduinoCore-avr has Stack-Based Buffer Overflow in WString Float/Double Constructors
Original description
The description as published by the source.
ArduinoCore-avr contains the source code and configuration files of the Arduino AVR Boards platform. A vulnerability in versions prior to 1.8.7 allows an attacker to trigger a stack-based buffer overflow when converting floating-point values to strings with high precision. By passing very large decimalPlaces values to the affected String constructors or concat methods, the dtostrf function writes beyond fixed-size stack buffers, causing memory corruption and denial of service. Under specific conditions, this could enable arbitrary code execution on AVR-based Arduino boards.
Patches
-
The Fix is included starting from the
1.8.7release available from the following link ArduinoCore-avr v1.8.7 -
The Fixing Commit is available at the following link 1a6a417f89c8901dad646efce74ae9d3ddebfd59
References
Credits
- Maxime Rossi Bellom and Ramtine Tofighi Shirazi from SecMate (https://secmate.dev/)
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2025-69209 arduino-core-avr
- Ubuntu UBUNTU-CVE-2025-69209 arduino-core-avr
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- patch github.com
- patch github.com
- web github.com
- web support.arduino.cc