CVE-2025-59828: @anthropic ai/claude code Claude Code Vulnerable To Arbitrary Vulnerability

HIGH
Advisory Identifier: GHSA-2jjv-qf24-vfm4
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CWE-829 CWE-862
Published
Advisory Summary

CVE-2025-59828 is a HIGH claude code vulnerable to arbitrary vulnerability (CWE-829: Inclusion of Functionality from Untrusted Control Sphere) affecting @anthropic ai/claude code libraries in the npm ecosystem. The issue involves claude code vulnerable to arbitrary code execution via plugin autoloading with specific yarn versions. Remediation is available by upgrading affected packages to version 1.0.39.

CVE-2025-59828 at a Glance

CVE Identifier CVE-2025-59828
GHSA Identifier GHSA-2jjv-qf24-vfm4
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-829: Inclusion of Functionality from Untrusted Control Sphere
Affected Product @anthropic ai/claude code
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2025-59828

To remediate this vulnerability, upgrade all affected @anthropic ai/claude code dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

@anthropic-ai/claude-code fixed: 1.0.39 
npm install @anthropic-ai/claude-code@1.0.39
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls @anthropic-ai/claude-code

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2025-59828, inspect your project dependencies using npm:

npm ls @anthropic-ai/claude-code

Analyze the terminal output to locate any version of @anthropic ai/claude code in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.0.39), your application is affected.

Note: The npm ls @anthropic-ai/claude-code 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-829: Inclusion of Functionality from Untrusted Control Sphere, where the product imports, requires, or includes executable functionality (such as a library) from a source that is outside of the intended control sphere. In @anthropic ai/claude code, 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

When using Claude Code with Yarn installed, Yarn config files can trigger code execution when running `yarn --version`. This could lead to a bypass of the directory trust dialog in Claude Code, as plugins and `yarnPath` could be executed prior to the user accepting the risks of working in an untrusted directory. Users on standard Claude Code auto-update will have received this fix automatically. Users performing manual updates are advised to update to the latest version. Thank you to Benjamin Faller, Redguard AG and Michael Hess for reporting this issue!

CVE-2025-59828 Affected @anthropic ai/claude code Versions

1 component(s)
Fixed Versions:
1.0.39
Product / Package Ecosystem Affected Versions Fixed Version
@anthropic-ai/claude-code
npm/@anthropic-ai/claude-code
npm
< 1.0.39
1.0.39

References

GitHub Advisory / Wiki ADVISORY
https://github.com/anthropics/claude-code/security/advisories/GHSA-2jjv-qf24-vfm4
NVD — CVE-2025-59828 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-59828
@anthropic ai/claude code Source Repository REPOSITORY
https://github.com/anthropics/claude-code
osv.dev/vulnerability/ghsa-... WEB
https://osv.dev/vulnerability/GHSA-2jjv-qf24-vfm4
CVE Official Record — CVE-2025-59828 CVE
https://www.cve.org/CVERecord?id=CVE-2025-59828
yarnpkg.com/advanced/plugin-tut... WEB
https://yarnpkg.com/advanced/plugin-tutorial

Frequently Asked Questions

What is CVE-2025-59828?
CVE-2025-59828 is a security vulnerability in @anthropic ai/claude code involving Claude Code Vulnerable to Arbitrary Code Execution via Plugin Autoloading with Specific Yarn Versions under CWE-829: Inclusion of Functionality from Untrusted Control Sphere.
Which @anthropic ai/claude code versions are affected?
Affected versions include releases prior to 1.0.39 across affected packages: @anthropic-ai/claude-code.
What version fixes CVE-2025-59828?
Upgrading to 1.0.39 (or the latest patched release for your respective branch) resolves the vulnerability.
Is @anthropic-ai/claude-code affected?
Yes, @anthropic-ai/claude-code is affected in releases prior to 1.0.39. Upgrade your dependency to 1.0.39 or later.
What CWE is associated with CVE-2025-59828?
CVE-2025-59828 is classified under CWE-829: Inclusion of Functionality from Untrusted Control Sphere (The product imports, requires, or includes executable functionality (such as a library) from a source that is outside of the intended control sphere.).
How can I check npm dependencies for CVE-2025-59828?
Run the dependency tree command: 'npm ls @anthropic-ai/claude-code'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-2jjv-qf24-vfm4",
  "modified" : "2025-12-22T16:31:26Z",
  "published" : "2025-09-24T18:57:44Z",
  "aliases" : [ "CVE-2025-59828" ],
  "summary" : "Claude Code Vulnerable to Arbitrary Code Execution via Plugin Autoloading with Specific Yarn Versions",
  "details" : "When using Claude Code with Yarn installed, Yarn config files can trigger code execution when running `yarn --version`. This could lead to a bypass of the directory trust dialog in Claude Code, as plugins and `yarnPath` could be executed prior to the user accepting the risks of working in an untrusted directory. Users on standard Claude Code auto-update will have received this fix automatically. Users performing manual updates are advised to update to the latest version.\n\nThank you to Benjamin Faller, Redguard AG and Michael Hess for reporting this issue!",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@anthropic-ai/claude-code"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.0.39"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/anthropics/claude-code/security/advisories/GHSA-2jjv-qf24-vfm4"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-59828"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/anthropics/claude-code"
  }, {
    "type" : "WEB",
    "url" : "https://osv.dev/vulnerability/GHSA-2jjv-qf24-vfm4"
  }, {
    "type" : "WEB",
    "url" : "https://www.cve.org/CVERecord?id=CVE-2025-59828"
  }, {
    "type" : "WEB",
    "url" : "https://yarnpkg.com/advanced/plugin-tutorial"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-829", "CWE-862" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-09-24T18:57:44Z",
    "nvd_published_at" : "2025-09-24T20:15:33Z"
  }
}