CVE-2026-18171 — Docker Sandboxes read-only runtime mount writable through its shared-export alias
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…
Published: 2026-08-12 · CVSS: 5.7 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7