CVE-2025-66479 LOW

CVE-2025-66479: Anthropic Sandbox Runtime Incorrectly Implemented Network Sandboxing

Vendor Anthropic-Experimental
Product sandbox-runtime
Weakness CWE-693
Published December 4, 2025
Last update December 5, 2025

CVSS base score

1.8/10
Attack vector Local
Attack complexity Low
Privileges required High
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

December 4, 2025 CVE published
December 5, 2025 Record updated