Docker Sandbox virtiofs readonly intent bypass
CVE-2026-18171 Published on August 12, 2026
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'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.
Vulnerability Analysis
CVE-2026-18171 can be exploited with local system access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
What is an AuthZ Vulnerability?
The software performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
CVE-2026-18171 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2026-18171
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Affected Versions
Docker Sandboxes:- Version 0.35.0, <= 0.38.0 is affected.