SB2026011388 - Multiple vulnerabilities in Microsoft Windows Local Security Authority Subsystem Service (LSASS)

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Use-after-free (CVE-ID: CVE-2026-20854)

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in Windows Local Security Authority Subsystem Service (LSASS). A remote user can execute arbitrary code on the target system.

2) NULL pointer dereference (CVE-ID: CVE-2026-20875)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in Windows Local Security Authority Subsystem Service (LSASS). A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.

Remediation

Install update from vendor's website.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20854
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20875