Aug 2026: .NET Elevation of Privilege Vulnerability
CVE-2026-62886 Published on August 11, 2026
.NET Elevation of Privilege Vulnerability
Integer overflow or wraparound in .NET allows an unauthorized attacker to elevate privileges locally.
Weakness Types
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.
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().
Products Associated with CVE-2026-62886
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Affected Versions
Microsoft .NET 10.0:- Version 10.0.0 and below 10.0.11 is affected.
- Version 8.0.0 and below 8.0.30 is affected.
- Version 9.0.0 and below 9.0.19 is affected.
- Version 17.14.0 and below 17.14.38 is affected.
- Version 18.0 and below 18.8.3 is affected.