CVE-2026-45657

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

Score

CVSS 3.1 9.8 Critical

Status

Analyzed - secure@microsoft.com

Published

2026-06-09

Last modified

2026-09-24

Weaknesses

CWE-122, CWE-416

Affected products

• Windows 11 23H2 (Microsoft)
• Windows 11 23h2 (Microsoft)
• Windows 11 24H2 (Microsoft)
• Windows 11 24h2 (Microsoft)
• Windows 11 25H2 (Microsoft)
• Windows 11 25h2 (Microsoft)
• Windows 11 26H1 (Microsoft)
• Windows 11 26h1 (Microsoft)
• Windows Server 2022 (Microsoft)
• Windows Server 2025 (Microsoft)

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45657