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CVE-2026-55011Critical

Microsoft Defender Remote Code Execution Vulnerability

MSRC advisory NVD CVE.org

Assessment

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

Severity
Critical
CVSS base score
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
Impact
Remote Code Execution
EPSS, next 30 days
0.5%Higher than 37.9% of scored CVEs · FIRST model run 26 Sep 2026 · about EPSS
Exploitability
Exploitation Less Likely
Publicly disclosed
No
Customer action
Required: apply the update
Component
Microsoft Defender
Weakness
CWE-191: Integer Underflow (Wrap or Wraparound)
Issued by
Microsoft
Published
14 Jul 2026 · July 2026
Last revised
14 Jul 2026

Updates that fix it

0 KBs

No KB listed

MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.

Affected products

System Center
1 affected product
  • Microsoft Malware Protection Engine
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