What’s Vulnerable › Vulnerabilities

CVE-2026-26399

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-20 · updated 2026-06-17
• Weakness: CWE-562

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

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

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