Vulnerabilities in pkg:npm/@anthropic-ai/sandbox-runtime
PACKAGECVE-2025-66479 is a LOW anthropic sandbox runtime incorrectly implemented vulnerability (CWE-693: Protection Mechanism Failure) affecting @anthropic ai/sandbox runtime libraries in the npm ecosystem. The issue involves anthropic sandbox runtime incorrectly implemented network sandboxing. Remediation is available by upgrading affected packages to version 0.0.16.
pkg:npm/@anthropic-ai/sandbox-runtime
Vulnerability advisories affecting package pkg:npm/@anthropic-ai/sandbox-runtime. Select an advisory below to view technical details or fixes.
| Advisory ID | CVE / NVD | Severity | Summary |
|---|---|---|---|
| GHSA-9gqj-5w7c-vx47 | CVE-2025-66479 | LOW | Anthropic Sandbox Runtime Incorrectly Implemented Network Sandboxing |
CVE-2025-66479 at a Glance
How to Fix CVE-2025-66479
To remediate this vulnerability, upgrade all affected @anthropic ai/sandbox runtime dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
npm install @anthropic-ai/sandbox-runtime@0.0.16Run the following command in your project directory to verify that all resolved dependencies use the patched release:
npm ls @anthropic-ai/sandbox-runtimeHow to Check if You Are Affected
To determine whether your Node.js application is affected by CVE-2025-66479, inspect your project dependencies using npm:
npm ls @anthropic-ai/sandbox-runtimeAnalyze the terminal output to locate any version of @anthropic ai/sandbox runtime in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.0.16), your application is affected.
Note: The npm ls @anthropic-ai/sandbox-runtime command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-693: Protection Mechanism Failure, where the product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product. In @anthropic ai/sandbox runtime, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2025-66479 Affected @anthropic ai/sandbox runtime Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
@anthropic-ai/sandbox-runtime
|
npm |
< 0.0.16
|
0.0.16
|
References
Frequently Asked Questions
What is CVE-2025-66479?
Which @anthropic ai/sandbox runtime versions are affected?
What version fixes CVE-2025-66479?
Is @anthropic-ai/sandbox-runtime affected?
What CWE is associated with CVE-2025-66479?
How can I check npm dependencies for CVE-2025-66479?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-9gqj-5w7c-vx47",
"modified" : "2025-12-04T22:50:11Z",
"published" : "2025-12-04T16:55:06Z",
"aliases" : [ "CVE-2025-66479" ],
"summary" : "Anthropic Sandbox Runtime Incorrectly Implemented Network Sandboxing ",
"details" : "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. \n\nThank you to https://github.com/bendrucker for reporting this issue!",
"severity" : [ {
"type" : "CVSS_V4",
"score" : "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"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "npm",
"name" : "@anthropic-ai/sandbox-runtime"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "0.0.16"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/anthropic-experimental/sandbox-runtime/security/advisories/GHSA-9gqj-5w7c-vx47"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-66479"
}, {
"type" : "WEB",
"url" : "https://github.com/anthropic-experimental/sandbox-runtime/commit/bea2930cc1db9c73a1b15acf6dc19c5261aec1f3"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/anthropic-experimental/sandbox-runtime"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-693" ],
"severity" : "LOW",
"github_reviewed" : true,
"github_reviewed_at" : "2025-12-04T16:55:06Z",
"nvd_published_at" : "2025-12-04T21:16:09Z"
}
}