Security November 2026 CVE-2026-113859
AssessmentUse after free in Windows TCP/IP allows an unauthorized attacker to execute code over an adjacent network.
Severity Critical
CVSS base score 7.5
Impact Remote Code Execution
Exploitation detected No known exploitation (MSRC assessment)
Exploitability Exploitation Less Likely
Publicly disclosed No (MSRC assessment)
EPSS · 30-day forecast No EPSS score collected
Customer action Required: follow the MSRC remediation guidance
More details
CVSS vector CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Public detection template No Nuclei template is listed in the current collected catalog
Component Windows TCP/IP
Weakness CWE-416: Use After Free
Issued by Microsoft
Last revised 10 Nov 2026 CVSS 3.1 base metrics Red raises the risk · green lowers it
Attack vector AdjacentAV:A
Attack complexity HighAC:H
Privileges required NonePR:N
User interaction NoneUI:N
Scope UnchangedS:U
Confidentiality HighC:H
Integrity HighI:H
Availability HighA:H
Updates that fix it5 KBs KB Type Restart Applies to Other CVEs
KB5131077
Security Hotpatch Update — Windows Server 2025, Windows Server 2025 (Server Core installation) All CVEs in KB5131077 KB5131080
Security Update Required Windows Server 2025, Windows Server 2025 (Server Core installation) All CVEs in KB5131080 KB5132043
Security Update — Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems and 3 more All CVEs in KB5132043 KB5132059
Security Update Required Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems All CVEs in KB5132059 KB5132061
Security Update Required Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems and 3 more All CVEs in KB5132061
Source. This summary comes from MSRC's public CVRF document for November 2026. If the MSRC page is blocked in your browser, the NVD and CVE.org records carry the same identifier. None of this says whether your devices are affected.
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