CVE-2026-77179

Summary

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 Software

Weaknesses

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

Workarounds

Use –clone mode and avoid additional read-write host mounts: https://docs.docker.com/ai/sandboxes/usage/#clone-mode

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

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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