CVE-2026-56857
Critical · 9.8CVSS
9.8
EPSS
0.5%
Published
Oct 8, 2026
CISA due date
—
The record
On Windows, when the target of Root.Mkdir or Root.MkdirAll is a junction pointing to an empty location, the operation can create a directory at the junction target even when that target is located outside the root. This only applies to operations where the last path component is a junction (path/to/junction, but not path/junction/target).
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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