CVE-2026-83781
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Improper Null Termination in Windows Program Compatibility Assistant Service

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Microsoft Corporation

Description
Improper null termination in Windows Program Compatibility Assistant Service allows an authorized attacker to elevate privileges locally.

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Meta Information

Published
2026-10-13
Last Modified
2026-10-13
Generated
2026-10-19
AI Q&A
2026-10-15
EPSS Evaluated
2026-10-18
NVD
CVE-2026-83781
EUVD
EUVD-2026-99997

Affected Vendors & Products

Showing 9 associated CPEs
Vendor Product Version / Range
Microsoft Windows 11 version 23H2 10.0.22631.0
Microsoft Windows 11 Version 23H2 10.0.22631.0
Microsoft Windows 11 Version 24H2 10.0.26100.0
Microsoft Windows 11 Version 25H2 10.0.26200.0
Microsoft Windows 11 version 26H1 10.0.28000.0
Microsoft Windows 11 Version 26H2 10.0.26300.0
Microsoft Windows Server 2022 10.0.20348.0
Microsoft Windows Server 2025 10.0.26100.0
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-170 The product does not terminate or incorrectly terminates a string or array with a null character or equivalent terminator.

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Executive Summary

This vulnerability involves improper null termination in the Windows Program Compatibility Assistant Service. An authorized attacker can exploit this to elevate their privileges locally on an affected system.

Impact Analysis

An attacker with local access could exploit this to gain higher privileges, potentially allowing them to install programs, view or delete data, or create new accounts with full user rights.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows Program Compatibility Assistant Service. Monitor Microsoft's update guide for specific patches related to CVE-2026-83781.

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