CVE-2026-42904: Windows TCP/IP Elevation of Privilege Vulnerability
Heap-based buffer overflow in Windows TCP/IP allows an unauthorized attacker to elevate privileges over an adjacent network.
Other sources
Windows TCP/IP Elevation of Privilege Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.22631.7219Patch KB5093998 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26200.8655Patch KB5094126 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.32995Patch KB5094125 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.19045.7417Patch KB5094127 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.19044.7417Patch KB5094127 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5256Patch KB5094128 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.28000.2269Patch KB5095051 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.8655Patch KB5094126
Event History
Frequently Asked Questions
What is the severity of CVE-2026-42904?
The severity of CVE-2026-42904 is critical, with a CVSS score of 9.6.
How do I fix CVE-2026-42904?
To fix CVE-2026-42904, apply the latest security updates provided by Microsoft for affected versions of Windows.
Who is affected by CVE-2026-42904?
CVE-2026-42904 affects users of Microsoft Windows 10, Windows 11, and Windows Server 2022 and 2025.
What type of vulnerability is CVE-2026-42904?
CVE-2026-42904 is classified as a heap-based buffer overflow vulnerability.
What could an attacker achieve by exploiting CVE-2026-42904?
An attacker could elevate privileges on the affected system over an adjacent network by exploiting CVE-2026-42904.