CVE-2026-56857
Published: October 9, 2026Last modified: October 16, 2026
Description
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).
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 9.8 |
| Attack Vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | HIGH |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | go | Unknown (1.19.7-r0) |
| 25 LTS | go | Unknown (1.24.3-r0) | |
| Stream | docker | Fixed (29.9.0-r0) | |
| go | Fixed (1.27.2-r0) | ||
| Hardened Containers | 23 LTS | go | Unknown (1.19.7-r0) |
| 25 LTS | go | Unknown (1.24.3-r0) | |
| Stream | go | Unknown (1.20.5-r2) |