CVE-2026-77179

Critical

Description

On macOS, the virtio-fs host server used by Docker Sandboxes improperly follows symlinks when reopening an unlinked file from a stored path. A malicious guest can replace a parent directory with a symlink, escape the shared workspace, and read or modify arbitrary host files as the VMM user, potentially achieving host code execution.

SeverityCritical

CVSS9.4

Exploit probability—

Product

Docker Sandboxes

PublishedSep 15, 2026

First seenSep 15, 2026

Weakness typeCWE-59Improper link resolution

How to fix

Update

docker docker_sandboxes0.42.0 or later

Vendor advisories

github.com/docker/sbx-releases/releases/tag/v0.42.0

Affected products

Product	Affected versions	Fixed in
docker docker_sandboxes	0.28.0 ≤ v < 0.42.0	0.42.0

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