Vulnerability · Published Dec 4, 2025 · Assigned by GitHub_M
CVE-2025-66479Anthropic Sandbox Runtime Incorrectly Implemented Network Sandboxing
Low 1.8
In plain English
A low-severity security flaw in sandbox-runtime from anthropic-experimental. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @anthropic-ai/sandbox-runtime | 0.0.16 | GHSA-9gqj-5w7c-vx47 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| anthropic-experimental | sandbox-runtime | < 0.0.16 |
Weakness: CWE-693 · 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