Arbitrary Code Execution in Claude Code <1.0.93 via $IFS Shell Flag Bypass
CVE-2025-66032 Published on December 3, 2025
Claude Code Command Validation Bypass Allows Arbitrary Code Execution
Claude Code is an agentic coding tool. Prior to 1.0.93, 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. This vulnerability is fixed in 1.0.93.
Weakness Type
What is a Command Injection Vulnerability?
The software constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.
CVE-2025-66032 has been classified to as a Command Injection vulnerability or weakness.
Products Associated with CVE-2025-66032
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Affected Versions
anthropics claude-code Version < 1.0.93 is affected by CVE-2025-66032Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.