CVE-2026-79994
8.7
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Docker | Docker Sandboxes | 0.37.0 < 0.42.0 | affected |
Weaknesses
- CWE-367: CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition
Workarounds
Use –clone mode and avoid additional read-write host mounts: https://docs.docker.com/ai/sandboxes/usage/#clone-mode
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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