Jul 2026: Windows NFS Server Elevation of Privilege Vulnerability
CVE-2026-56648 Published on July 14, 2026
Windows NFS Server Elevation of Privilege Vulnerability
Time-of-check time-of-use (toctou) race condition in Windows Network File System allows an authorized attacker to elevate privileges over a network.
Weakness Types
What is a TOCTTOU Vulnerability?
The software checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the software to perform invalid actions when the resource is in an unexpected state. This weakness can be security-relevant when an attacker can influence the state of the resource between check and use. This can happen with shared resources such as files, memory, or even variables in multithreaded programs.
CVE-2026-56648 has been classified to as a TOCTTOU vulnerability or weakness.
What is a Dangling pointer Vulnerability?
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.
CVE-2026-56648 has been classified to as a Dangling pointer vulnerability or weakness.
Products Associated with CVE-2026-56648
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Affected Versions
Microsoft Windows 10 Version 1607:- Version 10.0.14393.0 and below 10.0.14393.9339 is affected.
- Version 10.0.17763.0 and below 10.0.17763.9020 is affected.
- Version 10.0.19044.0 and below 10.0.19044.7548 is affected.
- Version 10.0.19045.0 and below 10.0.19045.7548 is affected.
- Version 10.0.26100.0 and below 10.0.26100.8875 is affected.
- Version 10.0.26200.0 and below 10.0.26100.8875 is affected.
- Version 10.0.28000.0 and below 10.0.28000.2525 is affected.
- Version 6.2.9200.0 and below 6.2.9200.26226 is affected.
- Version 6.2.9200.0 and below 6.2.9200.26226 is affected.
- Version 6.3.9600.0 and below 6.3.9600.23291 is affected.
- Version 6.3.9600.0 and below 6.3.9600.23291 is affected.
- Version 10.0.14393.0 and below 10.0.14393.9339 is affected.
- Version 10.0.14393.0 and below 10.0.14393.9339 is affected.
- Version 10.0.17763.0 and below 10.0.17763.9020 is affected.
- Version 10.0.17763.0 and below 10.0.17763.9020 is affected.
- Version 10.0.20348.0 and below 10.0.20348.5386 is affected.
- Version 10.0.26100.0 and below 10.0.26100.33158 is affected.
- Version 10.0.26100.0 and below 10.0.26100.33158 is affected.