CVE-2026-40405

published 2026-05-12

CVE-2026-40405: Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service over a network.

high 7.5 CVSS 3.1

AV N AC L PR N UI N S U C N I N A H

Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service over a network.

Affected

8 ranges

Vendor	Product	Version range	Fixed in
microsoft	windows_11_24h2	< 10.0.26100.8390	10.0.26100.8390
microsoft	windows_11_25h2	< 10.0.26200.8390	10.0.26200.8390
microsoft	windows_11_26h1	< 10.0.28000.2113	10.0.28000.2113
microsoft	windows_11_version_24h2	>= 10.0.26100.0 < 10.0.26100.8457	10.0.26100.8457
microsoft	windows_11_version_25h2	>= 10.0.26200.0 < 10.0.26200.8457	10.0.26200.8457
microsoft	windows_11_version_26h1	>= 10.0.28000.0 < 10.0.28000.2113	10.0.28000.2113
microsoft	windows_server_2025	< 10.0.26100.32772	10.0.26100.32772
microsoft	windows_server_2025	>= 10.0.26100.0 < 10.0.26100.32860	10.0.26100.32860

CWE-476