SB2026041577 - Multiple vulnerabilities in Microsoft Windows Hyper-V

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Input validation error (CVE-ID: CVE-2026-32149)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to insufficient validation of user-supplied input in Windows Hyper-V. A remote user can pass specially crafted input to the application and execute arbitrary code on the system.

2) Heap-based buffer overflow (CVE-ID: CVE-2026-26156)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in Windows Hyper-V. A remote attacker can trick a victim to open a specially crafted file, trigger a heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Remediation

Install update from vendor's website.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32149
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26156