Docker virtio-fs Symlink Traversal on macOS Host
CVE-2026-77179 Published on September 15, 2026
Docker Sandboxes guest can write arbitrary macOS host files via a symlink in the virtio-fs stored-path fallback
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.
Vulnerability Analysis
CVE-2026-77179 can be exploited with local system access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
What is an insecure temporary file Vulnerability?
The software attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.
CVE-2026-77179 has been classified to as an insecure temporary file vulnerability or weakness.
Products Associated with CVE-2026-77179
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Affected Versions
Docker Sandboxes:- Version 0.28.0 and below 0.42.0 is affected.