VulnerabilityAwaiting Analysis

CVE-2026-26399

After the function returns, interrupt service routines may dereference this dangling pointer, resulting in memory corruption.

MEDIUM 5.3EPSS 0.18%

Does this matter?

Lower severity and a low EPSS score (0.18%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 3.1: 5.3 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
EPSS: 0.18% probability · 8th percentile
CISA KEV: Not listed
Weakness: CWE-562
Source: cve@mitre.org

References

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.