What’s Vulnerable › Vulnerabilities

CVE-2026-79994: Docker Sandboxes UDS forwarder can reach arbitrary host Unix sockets through a symlink race

• Severity: high (CVSS 8.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-15 · updated 2026-09-16
• Weakness: CWE-367

Description

The guest-to-host Unix-domain socket relay in Docker Sandboxes validates that a socket path is inside an authorized workspace, but later reconnects using the pathname. A malicious guest can replace an intermediate directory with a symlink between validation and connection, causing the host to connect to an arbitrary AF_UNIX socket outside the shared workspace. This can expose data or host-side capabilities provided by the targeted socket.

Affected products

• Docker Sandboxes: from 0.37.0 before 0.42.0 — fixed in 0.42.0

How to fix

Upgrade to a fixed version: Docker Sandboxes 0.42.0. Check the vendor advisory for mitigations.

References

• https://docs.docker.com/ai/sandboxes/
• https://docs.docker.com/ai/sandboxes/security/isolation/
• https://github.com/docker/sailor/pull/2021
• https://github.com/docker/sandboxes/pull/5342
• https://github.com/docker/sbx-releases/releases/tag/v0.42.0

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