CVE-2026-55012

Integer overflow or wraparound in Microsoft Defender allows an unauthorized attacker to execute code locally.

CVSS 3.1

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

EPSS

0.5% chance of exploitation in the next 30 days; higher than 40% of CVEs (scores of 2026-10-25)

CWEs

CWE-122, CWE-190

Published

2026-07-14

Modified

2026-10-24

Record from

the NVD, synced 2026-10-25

Affected

• microsoft:malware_protection_engine

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55012

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