Oct 2026: Windows Graphics Component Elevation of Privilege Vulnerability
CVE-2026-85908 Published on October 13, 2026
Windows Graphics Component Elevation of Privilege Vulnerability
Heap-based buffer overflow in Windows Win32K - GRFX allows an authorized attacker to elevate privileges locally.
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-2026-85908
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Affected Versions
Microsoft Office 365 for Mac:- Version 1.0.0 and below 16.114.26101123 is affected.
- Version 16.0.1 and below 16.0.20430.20000 is affected.
- Version 16.0.1 and below 16.114.26101123 is affected.
- Version 16.0.0 and below 16.114.26101123 is affected.
- Version 10.0.14393.0 and below 10.0.14393.9612 is affected.
- Version 10.0.17763.0 and below 10.0.17763.9376 is affected.
- Version 10.0.19044.0 and below 10.0.19044.7807 is affected.
- Version 10.0.19045.0 and below 10.0.19045.7807 is affected.
- Version 10.0.22631.0 and below 10.0.22631.7652 is affected.
- Version 10.0.22631.0 and below 10.0.22631.7652 is affected.
- Version 10.0.26100.0 and below 10.0.26100.9711 is affected.
- Version 10.0.26200.0 and below 10.0.26200.9711 is affected.
- Version 10.0.28000.0 and below 10.0.28000.3231 is affected.
- Version 10.0.26300.0 and below 10.0.26300.9711 is affected.
- Version 6.2.9200.0 and below 6.2.9200.26434 is affected.
- Version 6.2.9200.0 and below 6.2.9200.26434 is affected.
- Version 6.3.9600.0 and below 6.3.9600.23470 is affected.
- Version 6.3.9600.0 and below 6.3.9600.23470 is affected.
- Version 10.0.14393.0 and below 10.0.14393.9612 is affected.
- Version 10.0.14393.0 and below 10.0.14393.9612 is affected.
- Version 10.0.17763.0 and below 10.0.17763.9376 is affected.
- Version 10.0.17763.0 and below 10.0.17763.9376 is affected.
- Version 10.0.20348.0 and below 10.0.20348.5761 is affected.
- Version 10.0.26100.0 and below 10.0.26100.33650 is affected.
- Version 10.0.26100.0 and below 10.0.26100.33650 is affected.