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Description
A stack-use-after-return issue exists in the Arduino_Core_STM32 library prior to version 1.7.0. The pwm_start() function allocates a TIM_HandleTypeDef structure on the stack and passes its address to HAL initialization routines, where it is stored in a global timer handle registry. After the function returns, interrupt service routines may dereference this dangling pointer, resulting in memory corruption.
References
github.com/stm32duino/Arduino_Core_STM32/releases/tag/1.6.1
github.com/Acen28/CVE-2026-26399-Disclosure