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Vulnerability record · CVE-2026-77179 · published 15 September 2026

CVE-2026-77179: Link following vulnerability

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.

9.4 CVSS 4.0 Critical EPSS 0.20% · top 91.3% CWE-59 · Link following Awaiting Analysis
9.4CVSS 4.0 base score
0.20%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
16 Sep 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2026-77179), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.