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Low · 1.8 CVE-2025-66479 EUVD-2025-201249GHSA-9gqj-5w7c-vx47

Anthropic Sandbox Runtime Incorrectly Implemented Network Sandboxing

Published Dec 4, 2025 · Updated Dec 5, 2025 · Assigned by GitHub_M

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 products

VendorProductAffectedFixed
anthropic-experimental sandbox-runtime < 0.0.16 —

Affected packages

EcosystemPackageAffectedFixedRecord
npm @anthropic-ai/sandbox-runtime < 0.0.16 0.0.16 GHSA-9gqj-5w7c-vx47

References