CVE-2026-72971 — MEDIUM (5.5)

Q: What is CVE-2026-72971?

CVE-2026-72971 is a vulnerability with a CVSS score of 5.5 (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.

Q: How severe is CVE-2026-72971?

CVE-2026-72971 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-72971?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Windows 11 26H1.

Vulnerability 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.

CVSS 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

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

HIGH

Availability

NONE

Affected Products

Vendor	Product	Versions
Microsoft	Windows 11 26H1	< 10.0.28000.2704

Related Weaknesses (CWE)

CWE-59

References

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

FAQ

What is CVE-2026-72971?

CVE-2026-72971 is a vulnerability with a CVSS score of 5.5 (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.

How severe is CVE-2026-72971?

CVE-2026-72971 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-72971?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Windows 11 26H1.