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Description

Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

PUBLISHED Reserved 2026-06-16 | Published 2026-07-14 | Updated 2026-07-14 | Assigner microsoft




HIGH: 7.8CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Problem types

CWE-191: Integer Underflow (Wrap or Wraparound)

CWE-122: Heap-based Buffer Overflow

Product status

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

16.0.0.0 (custom) before 16.0.5561.1001
affected

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

1.0.0 (custom) before 16.111.26071215
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 16.111.26071215
affected

16.0.0 (custom) before 16.111.26071215
affected

16.0.0.0 (custom) before 16.0.10417.20175
affected

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55039 (Microsoft Excel Remote Code Execution Vulnerability) vendor-advisory patch

cve.org (CVE-2026-55039)

nvd.nist.gov (CVE-2026-55039)

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