CVE-2026-69669: Microsoft Windows Kernel heap buffer overflow

CVE-2026-69669 · Severity: high · CVSS 8.8 · Published 2026-09-08

A heap-based buffer overflow vulnerability in the Windows Kernel could allow an attacker to execute malicious code remotely without requiring user credentials. If successfully exploited, an attacker could gain complete control over affected systems, leading to data theft, service disruption, or use of the system as a launching point for attacks on other networks.

Technologies: Microsoft Windows Kernel. Vendors: Microsoft.

Quick answers

Is CVE-2026-69669 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-69669 being exploited in the wild.
How severe is CVE-2026-69669?
High severity, with a CVSS score of 8.8, published 8 September 2026.
Which products and versions are affected?
Microsoft Windows Kernel.
Is there a fix for CVE-2026-69669?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-69669 attacked?
It is attacked over the network, in an operating system.
Am I affected by CVE-2026-69669?
Check whether you run Microsoft Windows Kernel. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A heap-based buffer overflow exists in the Windows Kernel that can be triggered over the network. The vulnerability allows an unauthenticated remote attacker to execute arbitrary code with kernel-level privileges. The exact vulnerable component and attack preconditions are not detailed in the available advisory excerpts, but the network-accessible attack vector and lack of authentication requirement suggest high exploitability. A patch is available from Microsoft via the Security Update Guide.

Affected products

  • Microsoft Windows Kernel

Timeline

  • 2026-09-08: disclosed

References

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