Root.Mkdir(All) can follow junctions out of the root on Windows in os

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2026-56857 · Microsoft / collected KEV context

EUVD-2026-95420

GHSA-c3q7-m35p-9qq7

GO-2026-6604

BIT-golang-2026-56857

cve-program · CVE-2026-56857

• 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

euvd · EUVD-2026-95420

• 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

nvd · CVE-2026-56857

• 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

osv · GO-2026-6604

• https://go.dev/cl/847305
• https://go.dev/issue/81739
• https://groups.google.com/g/golang-announce/c/U2fTuyDJznI

• 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 oper… · Advisory content revised · 1 Nov 2026