Docker Sandboxes sbx cp follows workspace symlinks outside the authorized host directory
Summary
| CVE | CVE-2026-103916 |
|---|---|
| State | PUBLISHED |
| Assigner | Docker |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-11-03 17:17:52 UTC |
| Updated | 2026-11-03 18:17:50 UTC |
| Description | Docker Sandboxes sbx cp does not safely confine host-side paths to a shared workspace. A malicious sandbox can create or replace a workspace symlink so that a later user-initiated copy reads a host file outside the workspace into the sandbox or writes sandbox-controlled data to a host path outside the workspace with the invoking user's permissions. |
Risk And Classification
Primary CVSS: v4.0 8.4 HIGH from [email protected]
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Problem Types: CWE-59 | CWE-59 CWE-59: Improper Link Resolution Before File Access ('Link Following')
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 8.4 | HIGH | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/C... |
| 4.0 | CNA | CVSS | 8.4 | HIGH | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
CVSS v4.0 Breakdown
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Docker | Docker Sandboxes | affected 0.28.0 0.51.0 semver | MacOS, Linux, Windows |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| docs.docker.com/ai/sandboxes/security/isolation | [email protected] | docs.docker.com | |
| github.com/docker/sbx-releases/releases/tag/v0.51.0 | [email protected] | github.com | |
| docs.docker.com/ai/sandboxes | [email protected] | docs.docker.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Peyton Kennedy of Endor Labs (en)
Additional Advisory Data
Solutions
CNA: Upgrade Docker Sandboxes to version 0.51.0 or later.
Workarounds
CNA: Until upgrading, do not use sbx cp with a host-side source or destination inside a workspace writable by untrusted sandbox code. Use a host-only path for the copy instead.