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CVE-2026-72971

Windows Container Isolation FS Filter Driver (unionfs.sys) Tampering Vulnerability

MEDIUM
5.5
CVSS Score
Published: August 11, 2026 at 05:05 PM UTC
Updated: October 30, 2026 at 05:21 PM UTC
1 product affected across 1 vendorWindows 11 26H1

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Windows 11 26H1· Microsoft
95%
v < 10.0.28000.270410.0.28000.0
Affected range stops below 10.0.28000.2704, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUMmicrosoft
Vector?

Quick Info

StatusANALYZED
CWE
CWE-59

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