Heap-based buffer overflow in Microsoft GDK - CVE-2026-66801
Published: November 11, 2026
Vulnerability identifier: #VU165709
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-66801
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a heap-based buffer overflow in an Xbox network service when processing network packets. A remote attacker can send a specially crafted packet to the affected service to execute arbitrary code on the target system.
Affected software
Microsoft GDK
How to mitigate CVE-2026-66801
Install security update from vendor's website.
Microsoft GDK - update to 2610