CVE-2026-77179: Docker Sandboxes

Critical severity, CVSS 9.4. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Docker Docker Sandboxes: from 0.28.0, before 0.42.0 (fixed in 0.42.0)

Published 2026-09-15. Last modified 2026-09-16.