Use-after-free in Windows Server - CVE-2026-78445
Published: September 9, 2026
Vulnerability identifier: #VU148203
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-2026-78445
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to use-after-free in the Windows Services for NFS ONCRPC XDR Driver when processing a specially crafted call to a Network File System service. A remote attacker can make a specially crafted call to a Network File System service to execute arbitrary code.
Affected software
Windows Server
How to mitigate CVE-2026-78445
Install security update from vendor's website.
Windows Server - addressed in versions 2012 R2 6.3.9600.23397, 2012 6.2.9200.26349, 2016 10.0.14393.9512, 2019 10.0.17763.9245, 2022 10.0.20348.5622, 2025 10.0.26100.33438