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TI-2025-40903 Aliases CVE-2025-66479GHSA-9gqj-5w7c-vx47

Anthropic Sandbox Runtime Incorrectly Implemented Network Sandboxing

Priority LOW 9CWE-693Published · Updated

Key facts

Attack vector
Local
Privileges required
High
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Security bypass
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-693.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00175 7th percentileScored 2026-11-07
Fix Fixed sandbox-runtime (anthropic-experimental): 0.0.16@anthropic-ai/sandbox-runtime (npm): 0.0.16

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
anthropic-experimentalsandbox-runtimebefore 0.0.160.0.16Patch availableCNA
—@anthropic-ai/sandbox-runtime (npm)before 0.0.160.0.16Patch availableGHSA-9gqj-5w7c-vx47
  • sandbox-runtime Vendoranthropic-experimental Affected before 0.0.16 Fixed in 0.0.16 Patch available CNA
  • @anthropic-ai/sandbox-runtime (npm) Vendor— Affected before 0.0.16 Fixed in 0.0.16 Patch available GHSA-9gqj-5w7c-vx47

Remediation

  • Fix · CNA sandbox-runtime (anthropic-experimental) Fixed in 0.0.16
  • Fix · GHSA-9gqj-5w7c-vx47 @anthropic-ai/sandbox-runtime (npm) Fixed in 0.0.16 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-66479
  2. 2026-10-03 Alias added: GHSA-9gqj-5w7c-vx47

References

Advisory 1

Other 3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences