CVE-2026-72971

MEDIUM

Improper link resolution before file access ('link following') in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to perform tampering locally.

CVSS v3.1 Score

5.5
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Published: 8/11/2026Modified: 8/14/2026

Related Intelligence (3)

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Patch Tuesday August 2026: A zero-day WinSock driver hole under exploit, and a maximum severity SAP vulnerability

A currently exploited zero-day elevation of privilege vulnerability that needs to be patched in a Windows driver for WinSock is the highlight of the 398 fixes issued today in Microsoft’s August Patch Tuesday releases. The hole is in Windows’ Ancillary Function Driver for WinSock ( CVE-2026-68820 ), which, according to Todd Schell , principal product manager at Ivanti, has been a recurring target f

CVE-2026-68820CVE-2026-58231
CSO Online
CRITICALVulnerability

Microsoft Plugs Nearly 400 Security Holes

Microsoft today released updates to remedy at least 398 security vulnerabilities in its Windows operating systems and supported software, including one weakness that is already being actively exploited and two others that were publicly detailed prior to today.

CVE-2026-62832CVE-2026-68820
Krebs on Security
CRITICALZero Day

Patch Tuesday - August 2026

Microsoft is publishing 421 vulnerabilities on August 2026 Patch Tuesday , including 236 vulnerabilities in Windows. This is lower volume than last month’s record-breaking behemoth, but still one of the largest Patch Tuesday totals ever. There is no reason to suppose that Patch Tuesday will ever return to the lower volumes we saw prior to 2026. Microsoft is aware of exploitation in the wild for on

CVE-2026-63520CVE-2026-55040
Rapid7

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-72971Vendor AdvisoryPatch