CVE-2026-18171 — Docker Sandboxes read-only runtime mount writable through its shared-export alias

CVE-2026-18171

Docker Sandboxes read-only runtime mount writable through its shared-export alias PUBLISHED

Description (CNA)

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 (CNA)

Vendor / product	Versions
Docker / Docker Sandboxes	affected 0.35.0 through 0.38.0

CWE

CWE-863

References

https://docs.docker.com/ai/sandboxes/
https://docs.docker.com/ai/sandboxes/architecture/

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.