MEDIUM CWE-59
CVE-2026-72971
Windows Container Isolation FS Filter Driver (unionfs.sys) Tampering Vulnerability
Microsoft·Windows 11 version 26H1
5.5/ 10
CVSS 3.1
Medium severity
0.36%
EPSS exploit odds
Chance of exploitation in the next 30 days
Higher than 31% of all CVEs
Not listed
CISA KEV catalog
No confirmed in-the-wild exploitation on CISA's list.
Timeline
- Published
- Aug 11, 2026
- Updated
- Oct 30, 2026
- First covered
- Aug 11, 2026
- Latest story
- 3 months ago
Summary
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.
CWE-59Improper Link Resolution Before File Access ('Link Following')
Attack profile
Attack vectorLocal
ComplexityLow
PrivilegesLow
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:CAffected products
- Microsoft Windows 11 version 26H110.0.28000.0 to before 10.0.28000.2704