CVE-2025-66479: Anthropic-Experimental Sandbox-Runtime

Low severity, CVSS 1.8. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Anthropic-Experimental Sandbox-Runtime: before 0.0.16 (fixed in 0.0.16)

Published 2025-12-04. Last modified 2026-06-17.