Anthropic Sandbox Runtime — Vulnerability (CVE-2025-66479)
Date: 2025-12
Attack vector: other
Category: vulnerability-disclosure
Severity: Medium
CVE: CVE-2025-66479
CWE: CWE-693

Anthropic Sandbox Runtime is a lightweight sandboxing tool for enforcing filesystem and network restrictions on arbitrary processes at the OS level, without requiring a container. Prior to 0.0.16, due to a bug in sandboxing logic, sandbox-runtime did not properly enforce a network sandbox if the sandbox policy did not configure any allowed domains. This could allow sandboxed code to make network requests outside of the sandbox. A patch for this was released in v0.0.16.


Mitigations:

Architectural layers (MAESTRO):