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

Quick assessment

Affected
Docker Docker Sandboxes
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 macOS 上，Docker 沙箱使用的 virtio-fs 宿主服务器在从已存储的路径重新打开一个已被卸载（unlinked）的文件时，对符号链接（symlinks）的处理存在不当之处。恶意客户机（guest）可以利用此漏洞，将一个父目录替换为符号链接，从而逃逸出共享工作区，并以 VMM 用户的身份读取或修改宿主系统上的任意文件，进而有可能实现宿主代码执行。

CVSS 9.4 · Critical

Possible ATT&CK Techniques 1 AI

T1611 · Escape to Host

Affected Version Matrix 1

VendorProduct Version RangeStatus
Docker Docker Sandboxes 0.28.0< 0.42.0 affected
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I. Basic Information for CVE-2026-77179

Vulnerability Information
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Vulnerability Title
Docker Sandboxes guest can write arbitrary macOS host files via a symlink in the virtio-fs stored-path fallback
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Docker Docker Sandboxes 0.28.0 ~ 0.42.0 cpe:2.3:a:docker:docker_sandboxes:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-77179

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III. Intelligence Information for CVE-2026-77179

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Vendor Pages for CVE-2026-77179 (3)

IV. Related Vulnerabilities

Same product: Docker Sandboxes
Same vendor: Docker
Same weakness: CWE-59

V. Comments for CVE-2026-77179

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