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CVE-2026-42904

CriticalCVSS 9.6/10Last modified Jul 23, 2026

Description

Heap-based buffer overflow in Windows TCP/IP allows an unauthorized attacker to elevate privileges over an adjacent network.

Metrics

CVSS 3.1 9.6/10CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Weakness enumeration

Affected software

Vendor	Product	Versions
Microsoft	Windows 10 Version 21H2	>= 10.0.19044.0, < 10.0.19044.7417
Microsoft	Windows 10 Version 22H2	>= 10.0.19045.0, < 10.0.19045.7417
Microsoft	Windows 11 version 23H2	>= 10.0.22631.0, < 10.0.22631.7219
Microsoft	Windows 11 Version 23H2	>= 10.0.22631.0, < 10.0.22631.7219
Microsoft	Windows 11 Version 24H2	>= 10.0.26100.0, < 10.0.26100.8655
Microsoft	Windows 11 Version 25H2	>= 10.0.26200.0, < 10.0.26200.8655
Microsoft	Windows 11 version 26H1	>= 10.0.28000.0, < 10.0.28000.2269
Microsoft	Windows Server 2022	>= 10.0.20348.0, < 10.0.20348.5256
Microsoft	Windows Server 2025	>= 10.0.26100.0, < 10.0.26100.32995
Microsoft	Windows Server 2025 (Server Core installation)	>= 10.0.26100.0, < 10.0.26100.32995

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42904Vendor Advisory

Timeline

Published: Jun 9, 2026
Last modified: Jul 23, 2026
NVD status: Analyzed

Related CVEs from 2026

CVE-2026-429057.8Use after free in Windows DWM Core Library allows an authorized attacker to elevate privileges locally.CVE-2026-429065.5Exposure of sensitive information to an unauthorized actor in Windows Shell allows an authorized attacker to disclose information locally.CVE-2026-429076.5Exposure of sensitive information to an unauthorized actor in Windows Shell allows an authorized attacker to disclose information over a net CVE-2026-429087.5Out-of-bounds read in Windows RDP allows an unauthorized attacker to disclose information over a network.CVE-2026-429097.5Concurrent execution using shared resource with improper synchronization ('race condition') in Remote Desktop Client allows an unauthorized CVE-2026-429107.8Out-of-bounds write in Windows Hotpatch Monitoring Service allows an authorized attacker to elevate privileges locally.CVE-2026-429117.0Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.CVE-2026-429127.0Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Telephony Service allows an authorize CVE-2026-429137.5Concurrent execution using shared resource with improper synchronization ('race condition') in Remote Desktop Client allows an unauthorized CVE-2026-429145.3Out-of-bounds read in Windows Kerberos allows an authorized attacker to deny service over a network.CVE-2026-429155.5Incorrect calculation of buffer size in Windows VMSwitch allows an authorized attacker to deny service locally.CVE-2026-429167.8Integer overflow or wraparound in Windows NT OS Kernel allows an authorized attacker to elevate privileges locally.

CVE-2026-42904: Critical severity, CVSS 9.6 | Vulnix