CVE-2025-66479

Anthropic Sandbox Runtime Incorrectly Implemented Network Sandboxing

Published Dec 4, 2025 CVSS 4.0 · 1.8 Low EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-9gqj-5w7c-vx47 Anthropic Sandbox Runtime Incorrectly Implemented Network Sandboxing
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Anthropic
Anthropic sandbox-runtime
Vendors & Products Anthropic
Anthropic sandbox-runtime
Type Values Removed Values Added
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.
Title Anthropic Sandbox Runtime Incorrectly Implemented Network Sandboxing
Weaknesses CWE-693
References
Metrics cvssV4_0

{'score': 1.8, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Dec 5, 2025, 5:04 PM
Reserved
Dec 2, 2025, 5:09 PM
Status
Deferred
Published
Dec 4, 2025, 9:16 PM
Modified
Oct 18, 2026, 3:10 PM