Jul 2026: Windows NFS Server Elevation of Privilege Vulnerability
CVE-2026-56194 Published on July 14, 2026
Windows NFS Server Elevation of Privilege Vulnerability
Heap-based buffer overflow in Windows Network File System allows an authorized attacker to elevate privileges over a network.
Weakness Types
Heap-based Buffer Overflow
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
Integer Overflow or Wraparound
The software performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. An integer overflow or wraparound occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may wrap to become a very small or negative number. While this may be intended behavior in circumstances that rely on wrapping, it can have security consequences if the wrap is unexpected. This is especially the case if the integer overflow can be triggered using user-supplied inputs. This becomes security-critical when the result is used to control looping, make a security decision, or determine the offset or size in behaviors such as memory allocation, copying, concatenation, etc.
Products Associated with CVE-2026-56194
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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.