Published Nov 10, 2026Sources checked Nov 10, 2026
5.5MEDIUMCVSS out of 10
What this means
Review the available evidence
CVE-2026-113771 and is rated Medium severity with a CVSS score of 5.5. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.
What to do next
Remediation and response
Microsoft Security Response Center guidance
Vendor revision: Nov 10, 2026
Install KB5132059.
Vendor-listed releases
10.0.28000.3501
CISA KEVNot listedBased on the latest collected catalog
EPSSUnavailableNo current score collected
Ransomware useNot markedCISA KEV ransomware field
Threat actors0Source-linked actor relationships
Overview
What is CVE-2026-113771?
Off-by-one error in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to elevate privileges locally.