CVE-2026-56857

critical · 9.8

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).

9.8

CVSS

0.6%

EPSS (exploit prob.)

46th

EPSS percentile

2026-10-08

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-1386

References

https://go.dev/cl/847305
https://go.dev/issue/81739
https://groups.google.com/g/golang-announce/c/U2fTuyDJznI
https://pkg.go.dev/vuln/GO-2026-6604

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-56857