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Vulnerabilities CVE-2026-18171

CVE-2026-18171

Medium
Open
TLP:CLEAR

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

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Description

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.

Details

CVSS Score
5.7
CVSS Vector
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Confidence
90%
Published
Aug 12, 2026
Last Modified
Aug 12, 2026
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