CVE-2026-40359

High

Published: 12 May 2026

Published

12 May 2026

Modified

12 May 2026

KEV Added

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Patch

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CVSS Score 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Score N/A

Risk Priority 16 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-40359 is a high-severity Use After Free (CWE-416) vulnerability. Its CVSS base score is 7.8 (High).

Operationally, it is not currently listed in the CISA KEV catalog.

Threat & Defense Details

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

addresses: CWE-416

Use-after-free exploits that achieve arbitrary code execution are blocked or significantly hardened by non-executable pages and ASLR.

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Deeper analysisAI

Automated synthesis unavailable for this CVE.