Go/stdlib CVE-2026-56857: critical 9.8
Root.Mkdir(All) can follow junctions out of the root on Windows in os
Action: Upgrade stdlib to 1.26.9 or later.
Upgrade Go to 1.26.9.
Upgrade Go to 1.27.2.
Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 1.26.9 | - |
| 1.27.0-0 | 1.27.2 | - |
Fixed versions
| 1.26.9 | 1.27.2 |
Sources
- osv: 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
CVE-2026-56857 · published · modified · JSON