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Description

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

PUBLISHED Reserved 2026-04-11 | Published 2026-05-12 | Updated 2026-05-20 | Assigner microsoft




HIGH: 8.4CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Problem types

CWE-122: Heap-based Buffer Overflow

Product status

16.0.1 (custom) before https://aka.ms/OfficeSecurityReleases
affected

16.0.0 (custom) before 16.0.5552.1000
affected

19.0.0 (custom) before https://aka.ms/OfficeSecurityReleases
affected

16.0.1 (custom) before 16.0.19822.20190
affected

16.0.1 (custom) before https://aka.ms/OfficeSecurityReleases
affected

16.0.0 (custom) before https://aka.ms/OfficeSecurityReleases
affected

16.0.1 (custom) before 16.109.26051019
affected

16.0.0 (custom) before 16.109.26051019
affected

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40363 (Microsoft Office Remote Code Execution Vulnerability) vendor-advisory patch

cve.org (CVE-2026-40363)

nvd.nist.gov (CVE-2026-40363)

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