What’s Vulnerable › Vulnerabilities

CVE-2026-77179: Docker Sandboxes guest can write arbitrary macOS host files via a symlink in the virtio-fs stored-path fallback

• Severity: critical (CVSS 9.4 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-15 · updated 2026-09-16
• Weakness: CWE-59

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.

Affected products

• Docker Sandboxes: from 0.28.0 before 0.42.0 — fixed in 0.42.0

How to fix

Upgrade to a fixed version: Docker Sandboxes 0.42.0. Check the vendor advisory for mitigations.

References

• https://docs.docker.com/ai/sandboxes/
• https://docs.docker.com/ai/sandboxes/security/isolation/
• https://github.com/docker/sbx-releases/releases/tag/v0.42.0

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