Anthropic Sandbox Runtime Incorrectly Implemented Network Sandboxing
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.
Thank you to https://github.com/bendrucker for reporting this issue!
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | @anthropic-ai/sandbox-runtime | < 0.0.16 | 0.0.16 |
References
- https://github.com/anthropic-experimental/sandbox-runtime/security/advisories/GHSA-9gqj-5w7c-vx47
- https://nvd.nist.gov/vuln/detail/CVE-2025-66479
- https://github.com/anthropic-experimental/sandbox-runtime/commit/bea2930cc1db9c73a1b15acf6dc19c5261aec1f3
- https://github.com/anthropic-experimental/sandbox-runtime
- 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- Weakness (CWE)
CWE-693- Platform
- npm
- Package
@anthropic-ai/sandbox-runtime- Disclosed
- 04.12.2025
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-9gqj-5w7c-vx47 - CC BY 4.0
Vulnerability history: @anthropic-ai/sandbox-runtime
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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