CVE-2026-72971 json
Windows Container Isolation FS Filter Driver (unionfs.sys) Tampering Vulnerability
published 2026-08-11 2 mo ago modified 2026-10-30 9 d ago also EUVD-2026-56603
- cvss
- 5.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 30%
- public exploits
- 0
- none known
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.
Patch / fix
- Microsoft Windows 11 version 26H1 10.0.28000.2704
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.36% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C |
| CNA | 3.1 | 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
Affected products
- Microsoft Windows 11 version 26H1
Classification
- Weakness
-
- CWE-59 Improper Link Resolution Before File Access
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2026-72971
vendor-advisory, patch
Sources
- CVE List CVE-2026-72971
- NVD CVE-2026-72971
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