CVE-2026-77179

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

State: Published
Severity: 9.4 Critical
Published: Sep 15, 2026
Updated: Sep 15, 2026
Reserved: Aug 20, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	9.4 Critical	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H	Docker

Weaknesses

CWE-59 Improper Link Resolution Before File Access ('Link Following')

Affected Products

Product	Versions
Docker SandboxesDocker	0.28.0 to before 0.42.0Affected

References

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

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