What EVULNABLE says
Publicly disclosed before a patch shipped, and CVSS base score 5.5.
Scheduled Maintenance
CVE-2026-72971
Microsoft — Windows Container Isolation FS Filter Driver (unionfs.sys) Tampering Vulnerability
Patch Tuesday
The priority band answers “how soon”, not “how bad” — see Methodology for what it weighs and where it abstains.
The evidence behind it
| Measure | Value | Source |
|---|---|---|
| CVSS base score | 5.5 | — |
| FIRST EPSS | 0.005 (39.2nd pctl) | FIRST |
| Actively exploited | Not confirmed | Patch Tuesday |
The primary records
This page is an opinion about urgency. Where it and a source of record disagree, the source of record is the record.
Where this sits
CVE-2026-72971 is one of the entries ranked on the priority feed and in this month's Microsoft release.