Review reviewHigh

CVE-2026-55012

Microsoft Microsoft Malware Protection Engine, malware protection engine

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

CVSS
7.8
EPSS
0.37%
30.1% percentile
CISA KEV
Not listed
Published
2026.07.15
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.37%
Technical severityCVSS 7.8

Vulnerability overview

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

Affected product and versions

Product
Microsoft Microsoft Malware Protection Engine, malware protection engine
Affected versions
>= 1.1.0.0 < 1.1.26060.3008, < 1.1.26060.3008
Fixed versions
1.1.26060.3008

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Microsoft Microsoft Malware Protection Engine, malware protection engine and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE
CWE-122, CWE-190