CVE-2026-79994
HighCVSS 8.7Exploitation Probability (EPSS)
Low risk1th percentile - higher than 1% of all known CVEs
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.
Risk Assessment
The risk includes unauthorized access to host data or services, which could lead to container isolation breach and system compromise.
Recommendation
Update Docker Sandboxes to a patched version and implement additional path integrity checks, such as using file descriptors instead of paths.
Other vulnerabilities in Docker Sandboxes
See all- CVE-2026-77179Critical
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.
- CVE-2026-18171Medium
Docker Sandboxes (sbx) applies the read-only intent of a runtime host mount to the in-guest container bind only: the underlying virtio-fs host-edge grant is added to the sandbox's policy-share allowlist with no access mode. The directory stays writable at its shared-export path, so unprivileged code inside the sandbox can derive that path and write to a host directory the operator attached read-only.
- CVE-2026-12539Medium
The vulnerability in Docker Sandboxes (sbx) is that the ICMP egress block is applied only at network creation time and is not re-applied to networks rebuilt from disk after a Docker daemon restart. Consequently, a sandbox that survives a restart can forward ICMP to arbitrary hosts.
- CVE-2026-12039Medium
A vulnerability in Docker Sandboxes (sbx) allows bypassing the HTTP/S-only egress allowlist via DNS tunneling. The embedded DNS server forwards queries to the host resolver without policy enforcement, enabling untrusted workloads to exfiltrate data encoded in DNS labels.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS