CVE-2026-18171: Docker Sandboxes

Medium severity, CVSS 5.7. EPSS: 0.1% chance of exploitation in the next 30 days.

Docker Sandboxes (sbx) applies the read-only intent of a runtime host mount to the in-guest container bind only: the underlying virtio-fs host-edge grant is added to the sandbox's policy-share allowlist with no access mode. The directory stays writable at its shared-export path, so unprivileged code inside the sandbox can derive that path and write to a host directory the operator attached read-only.

Affected products

• Docker Docker Sandboxes: from 0.35.0, up to and including 0.38.0

Published 2026-08-12. Last modified 2026-08-18.