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CVE-2026-42831

nvd nist
Published: May 12, 2026Modified: Jun 17, 2026

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7.8
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Exploitability: 1.8 / Impact: 5.9
Source: secure@microsoft.com (Secondary)

Description

Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

Affected (3)

Microsoft
3 products
365 Copilot
Office
Office Long Term Servicing Channel
Configuration A
3 vulnerable
Vulnerable SoftwareAffected Versions
365 Copilot
Before 16.0.19822.20190
Office
Version 2024
Office Long Term Servicing Channel
Version 2021

Related CWEs

CWE-122
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().

References (1)

Source: secure@microsoft.com
Vendor Advisory

Timeline

No history available yet.