CVE-2026-56857

CVSS 9.8 (critical) · published 2026-10-08

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).

Weakness: CWE-1386

Source: NVD CVE-2026-56857

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

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