CVE-2026-26399

5.3 mediumEPSS 0.2%

Medium (5.3). EPSS 0.2% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

5.3 medium

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

EPSS: 0.2% chance of exploitation in the next 30 days; higher than 7% of CVEs (scores of 2026-10-31)
CWE: CWE-562
Published: 2026-04-20
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

References

https://github.com/Acen28/CVE-2026-26399-Disclosure
https://github.com/stm32duino/Arduino_Core_STM32/releases/tag/1.6.1

Check your stack JSON