---
id: CVE-2026-77179
title: >-
  On macOS, the virtio-fs host server used by Docker Sandboxes improperly
  follows symlinks when reopening an unlinked file from a stored path
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, an…
severity: critical
cvss: 9.4
cvssVector: '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'
cwe:
  - CWE-59
vendor: Docker
product: Docker Sandboxes
affected:
  - sandboxes >= 0.28.0 < 0.42.0
published: '2026-09-15'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T20:38:33.883'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77179'
references:
  - url: 'https://docs.docker.com/ai/sandboxes/'
    label: security@docker.com
  - url: 'https://docs.docker.com/ai/sandboxes/security/isolation/'
    label: security@docker.com
  - url: 'https://github.com/docker/sbx-releases/releases/tag/v0.42.0'
    label: security@docker.com
  - url: 'https://github.com/docker/sbx-releases/releases/tag/v0.41.0'
    label: security@docker.com
tags:
  - nvd
  - cve.org
  - exploit-available
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-15T15:00:58.602243Z'
cvssSource: cna
ingestedAt: '2026-09-15T14:38:16.197Z'
epss: 0.0016
epssPercentile: 0.0558
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/HORKimhab/CVE-2026-77179'
  checkedAt: '2026-09-21T15:30:42.361Z'
exploitAvailable: true
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.