# CVE-2026-26399

> Vulnerability · severity: **MEDIUM** (CVSS 5.3).

## 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.

## Key facts

- **CVE ID:** CVE-2026-26399
- **Published:** 2026-04-20
- **CVSS severity:** MEDIUM
- **CVSS base score:** 5.3
- **CWE codes:** CWE-562

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-26399

## Citation

> AI Analytics. CVE-2026-26399. Retrieved 2026-08-17 from https://api.ai-analytics.org/cve/CVE-2026-26399. Derived from NIST NVD. Licensed CC0.

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