Summary
Claude Code Command Validation Bypass Allows Arbitrary Code Execution
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 from GMO Flatt Security Inc. for reporting this issue!
Impact
The application does not adequately validate input before processing it, allowing unexpected values to reach sensitive code paths. Typical impact: varies by context: data corruption, logic bypass, or denial of service.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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Frequently Asked Questions
- What is CVE-2025-66032? CVE-2025-66032 is a high-severity improper input validation vulnerability in @anthropic-ai/claude-code (npm), affecting versions < 1.0.93. It is fixed in 1.0.93. The application does not adequately validate input before processing it, allowing unexpected values to reach sensitive code paths.
- Which versions of @anthropic-ai/claude-code are affected by CVE-2025-66032? @anthropic-ai/claude-code (npm) versions < 1.0.93 is affected.
- Is there a fix for CVE-2025-66032? Yes. CVE-2025-66032 is fixed in 1.0.93. Upgrade to this version or later.
- Is CVE-2025-66032 exploitable, and should I be worried? Whether CVE-2025-66032 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2025-66032 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2025-66032? Upgrade
@anthropic-ai/claude-codeto 1.0.93 or later.