1. Home
  2. CVE Database
  3. CVE-2026-55011
HIGH · 7.8

CVE-2026-55011

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

Vulnerability Description

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

CVSS Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

Affected Products

VendorProductVersions
MicrosoftMalware Protection Engine< 1.1.26060.3008

Related Weaknesses (CWE)

CWE-191

References

FAQ

What is CVE-2026-55011?

CVE-2026-55011 is a vulnerability with a CVSS score of 7.8 (HIGH). Integer underflow (wrap or wraparound) in Microsoft Defender allows an unauthorized attacker to execute code locally.

How severe is CVE-2026-55011?

CVE-2026-55011 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-55011?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Malware Protection Engine.