PT-2026-40198 · Microsoft · Office

Published 2026-05-12 · Updated 2026-05-12 · CVE-2026-40363

Positive Technologies (AI Summary)

CVSS v3.1

8.4

High

Base vector

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

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

Description A heap-based buffer overflow allows an unauthorized attacker to execute arbitrary code locally and remotely, affecting the system. A heap-based buffer overflow occurs when an application writes more data to a heap-allocated memory block than it can hold, potentially corrupting adjacent memory.

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:2026-06753

CVE-2026-40363

Affected Products

Office

References · 4

• https://bdu.fstec.ru/vul/2026-06753 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-40363 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40363 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-40363 · Security Note