PT-2026-40197 · Microsoft · Office Excel

Published 2026-05-12 · Updated 2026-05-12 · CVE-2026-40362

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Microsoft Office Excel (affected versions not specified)

Description A heap-based buffer overflow allows an unauthorized attacker to execute code locally. This occurs when the software fails to properly handle memory allocation on the heap, which is a region of memory used for dynamic memory allocation, potentially leading to remote code execution through malicious .xlsx files.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

RCE

Heap Based Buffer Overflow

Weakness Enumeration

CWE-122

Related Identifiers

BDU:2026-07129

CVE-2026-40362

Affected Products

Office Excel

References · 5

• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-40362 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-40362 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40362 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-07129 · Security Note
• https://twitter.com/windowsforum/status/2054315787750461675 · Twitter Post