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CVE-2025-66032 — Vulnerability in @anthropic-ai/claude-code — CVE...

HIGH

Claude Code Command Validation Bypass Allows Arbitrary Code Execution

Published December 3, 2025Updated December 5, 2025Source: osv

Summary

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!

Advisory Timeline

  • First published December 3, 2025 (313 days ago).
  • Last revised December 5, 2025 — 2 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

npm
Update @anthropic-ai/claude-code to 1.0.93 or later
npm install @anthropic-ai/claude-code@1.0.93

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: npm (1).

PackageEcosystemAffectedFixed In
@anthropic-ai/claude-code
npm
All versions1.0.93

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 8.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
P
Scope
—
Confidentiality
—
Integrity
—
Availability
—

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

References

Frequently Asked Questions

What is CVE-2025-66032?
Claude Code Command Validation Bypass Allows Arbitrary Code Execution This vulnerability has been assigned a severity rating of HIGH (CVSS score: 8.8/10).
How do I check if my project is affected by CVE-2025-66032?
CVE-2025-66032 affects @anthropic-ai/claude-code. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2025-66032 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
8.8

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-xq4m-mc3c-vvg3

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