Oct 2026: Microsoft Office Excel Remote Code Execution Vulnerability
CVE-2026-97767 Published on October 13, 2026
Microsoft Office Excel Remote Code Execution Vulnerability
Double free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
Weakness Types
What is a Double-free Vulnerability?
The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. When a program calls free() twice with the same argument, the program's memory management data structures become corrupted. This corruption can cause the program to crash or, in some circumstances, cause two later calls to malloc() to return the same pointer. If malloc() returns the same value twice and the program later gives the attacker control over the data that is written into this doubly-allocated memory, the program becomes vulnerable to a buffer overflow attack.
CVE-2026-97767 has been classified to as a Double-free vulnerability or weakness.
NULL Pointer Dereference
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. NULL pointer dereference issues can occur through a number of flaws, including race conditions, and simple programming omissions.
Products Associated with CVE-2026-97767
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Affected Versions
Microsoft 365 Apps for Enterprise:- Version 16.0.1 and below https://aka.ms/OfficeSecurityReleases is affected.
- Version 1.0.0 and below 16.114.26101123 is affected.
- Version 16.0.1 and below 16.0.14334.20974 is affected.
- Version 16.0.0 and below 16.0.17932.21056 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 16.0.0.0 and below 16.0.10417.20228 is affected.