Sep 2026: Win32k Information Disclosure Vulnerability
CVE-2026-69609 Published on September 8, 2026
Win32k Information Disclosure Vulnerability
Out-of-bounds read in Windows Win32K allows an authorized attacker to disclose information locally.
Weakness Types
Out-of-bounds Read
The software reads data past the end, or before the beginning, of the intended buffer. Typically, this can allow attackers to read sensitive information from other memory locations or cause a crash. A crash can occur when the code reads a variable amount of data and assumes that a sentinel exists to stop the read operation, such as a NUL in a string. The expected sentinel might not be located in the out-of-bounds memory, causing excessive data to be read, leading to a segmentation fault or a buffer overflow. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent read operation then produces undefined or unexpected results.
What is an off-by-five Vulnerability?
A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value.
CVE-2026-69609 has been classified to as an off-by-five vulnerability or weakness.
Products Associated with CVE-2026-69609
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Affected Versions
Microsoft Office 365 for Mac:- Version 1.0.0 and below 16.112.26090911 is affected.
- Version 16.0.1 and below 16.0.20430.20000 is affected.
- Version 16.0.1 and below 16.112.26090911 is affected.
- Version 16.0.0 and below 16.112.26090911 is affected.