1. Home
  2. CVE Database
  3. CVE-2026-45657
CRITICAL · 9.8

CVE-2026-45657

Use after free in Windows Kernel allows an unauthorized attacker to execute code over a network.

Vulnerability Description

Use after free in Windows Kernel allows an unauthorized attacker to execute code over a network.

CVSS Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

Affected Products

VendorProductVersions
MicrosoftWindows 11 23H2< 10.0.22631.7219
MicrosoftWindows 11 24H2< 10.0.26100.8655
MicrosoftWindows 11 25H2< 10.0.26200.8655
MicrosoftWindows 11 26H1< 10.0.28000.2269
MicrosoftWindows Server 2022< 10.0.20348.5256
MicrosoftWindows Server 2025< 10.0.26100.32995

Related Weaknesses (CWE)

CWE-122CWE-416

References

FAQ

What is CVE-2026-45657?

CVE-2026-45657 is a vulnerability with a CVSS score of 9.8 (CRITICAL). Use after free in Windows Kernel allows an unauthorized attacker to execute code over a network.

How severe is CVE-2026-45657?

CVE-2026-45657 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-45657?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Windows 11 23H2, Microsoft Windows 11 24H2, Microsoft Windows 11 25H2, Microsoft Windows 11 26H1, Microsoft Windows Server 2022.