stm32duino Arduino_Core_STM32 up to 1.6.x pwm_start memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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7.6$0-$5k5.07

Summaryinfo

A vulnerability identified as critical has been detected in stm32duino Arduino_Core_STM32 up to 1.6.x. This vulnerability affects the function pwm_start. This manipulation causes memory corruption. The identification of this vulnerability is CVE-2026-26399. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in stm32duino Arduino_Core_STM32 up to 1.6.x and classified as critical. Affected by this vulnerability is the function pwm_start. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-26399 since 02/16/2026. The exploitation appears to be easy. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 1.7.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-23912). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.0
VulDB Meta Temp Score: 7.6

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Arduino_Core_STM32 1.7.0

Timelineinfo

02/16/2026 CVE reserved
04/20/2026 +62 days Advisory disclosed
04/20/2026 +0 days VulDB entry created
04/20/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-26399 (🔒)
GCVE (CVE): GCVE-0-2026-26399
GCVE (VulDB): GCVE-100-358339
EUVD: 🔒

Entryinfo

Created: 04/20/2026 19:58
Updated: 04/20/2026 23:33
Changes: 04/20/2026 19:58 (55), 04/20/2026 23:33 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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