CVE-2025-66032: Claude Code Command Validation Bypass Allows Arbitrary Code Execution

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-12-03 · updated 2026-06-17
Weakness: CWE-77

Description

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.

Affected products

anthropics claude-code: before 1.0.93 — fixed in 1.0.93

How to fix

Upgrade to a fixed version: anthropics claude-code 1.0.93. Check the vendor advisory for mitigations.

References

https://github.com/anthropics/claude-code/security/advisories/GHSA-xq4m-mc3c-vvg3

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