CVE-2025-66032: @anthropic ai/claude code Claude Code Command Validation Bypass Vulnerability

HIGH
Advisory Identifier: GHSA-xq4m-mc3c-vvg3
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CWE-20 CWE-77
Published
Advisory Summary

CVE-2025-66032 is a HIGH claude code command validation bypass vulnerability (CWE-20: Improper Input Validation) affecting @anthropic ai/claude code libraries in the npm ecosystem. The issue involves claude code command validation bypass allows arbitrary code execution. Remediation is available by upgrading affected packages to version 1.0.93.

CVE-2025-66032 at a Glance

CVE Identifier CVE-2025-66032
GHSA Identifier GHSA-xq4m-mc3c-vvg3
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-20: Improper Input Validation
Affected Product @anthropic ai/claude code
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2025-66032

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: 1.0.93 
npm install @anthropic-ai/claude-code@1.0.93
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-2025-66032, 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 1.0.93), 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-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. 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

Due to errors in parsing shell commands related to $IFS and short CLI flags, it was possible to bypass the Claude Code read-only validation and trigger arbitrary code execution. Reliably exploiting this requires the ability to add untrusted content into a Claude Code context window. Users on standard Claude Code auto-update have received this fix already. Users performing manual updates are advised to update to the latest version. Thank you to [RyotaK](hxxps://ryotak.net) from [GMO Flatt Security Inc.](hxxps://flatt.tech/en/) for reporting this issue!

CVE-2025-66032 Affected @anthropic ai/claude code Versions

1 component(s)
Fixed Versions:
1.0.93
Product / Package Ecosystem Affected Versions Fixed Version
@anthropic-ai/claude-code
npm/@anthropic-ai/claude-code
npm
< 1.0.93
1.0.93

References

GitHub Advisory / Wiki ADVISORY
https://github.com/anthropics/claude-code/security/advisories/GHSA-xq4m-mc3c-vvg3
NVD — CVE-2025-66032 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-66032
@anthropic ai/claude code Source Repository REPOSITORY
https://github.com/anthropics/claude-code

Frequently Asked Questions

What is CVE-2025-66032?
CVE-2025-66032 is a security vulnerability in @anthropic ai/claude code involving Claude Code Command Validation Bypass Allows Arbitrary Code Execution under CWE-20: Improper Input Validation.
Which @anthropic ai/claude code versions are affected?
Affected versions include releases prior to 1.0.93 across affected packages: @anthropic-ai/claude-code.
What version fixes CVE-2025-66032?
Upgrading to 1.0.93 (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 1.0.93. Upgrade your dependency to 1.0.93 or later.
What CWE is associated with CVE-2025-66032?
CVE-2025-66032 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check npm dependencies for CVE-2025-66032?
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-xq4m-mc3c-vvg3",
  "modified" : "2025-12-04T16:22:16Z",
  "published" : "2025-12-03T16:27:19Z",
  "aliases" : [ "CVE-2025-66032" ],
  "summary" : "Claude Code Command Validation Bypass Allows Arbitrary Code Execution",
  "details" : "Due to errors in parsing shell commands related to $IFS and short CLI flags, it was possible to bypass the Claude Code read-only validation and trigger arbitrary code execution. Reliably exploiting this requires the ability to add untrusted content into a Claude Code context window.\n\nUsers on standard Claude Code auto-update have received this fix already. Users performing manual updates are advised to update to the latest version.\n\nThank you to [RyotaK](hxxps://ryotak.net) from [GMO Flatt Security Inc.](hxxps://flatt.tech/en/) for reporting this issue!",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/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" : "1.0.93"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/anthropics/claude-code/security/advisories/GHSA-xq4m-mc3c-vvg3"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-66032"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/anthropics/claude-code"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20", "CWE-77" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-12-03T16:27:19Z",
    "nvd_published_at" : "2025-12-03T19:15:57Z"
  }
}