Main Vulnerability Database Vulnerabilities #VU147917

Heap-based buffer overflow in Microsoft Windows and Windows Server - CVE-2026-69729

Published: September 8, 2026

Vulnerability identifier: #VU147917

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-69729

CWE-ID: CWE-122

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote user to execute arbitrary code.

The vulnerability exists due to a heap-based buffer overflow in Windows Credential Providers when handling a specially crafted network request. A remote user can send a specially crafted request to execute arbitrary code.

User interaction is not required.

Affected software

Microsoft Windows
Windows Server

How to mitigate CVE-2026-69729

Install security update from vendor's website.

Microsoft Windows - addressed in versions 11 24H2 10.0.26100.9445, 11 25H2 10.0.26200.9445, 11 26H1 10.0.28000.2954
Windows Server - update to 2025 10.0.26100.33438

External References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-69729

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