CVE-2026-56857: Root.Mkdir(All) can follow junctions out of the root on Windows in os
Go standard library · os
Vendor fix available · Affected: Go standard library os · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 46% of scored CVEs
DescriptionCVE.org
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 products2
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Go standard library · osbefore 1.26.9; from 1.27.0-0 before 1.27.2
- Go standard library · internal/syscall/windowsbefore 1.26.9; from 1.27.0-0 before 1.27.2
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- Go standard library
- Published
- October 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-56857 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.