SB2026043039 - Command injection in Claude Code
Published: April 30, 2026
Security Bulletin ID
SB2026043039
CSH Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Command injection (CVE-ID: CVE-2025-66032)
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to command injection in the shell command parsing and validation logic when processing shell commands related to $IFS and short CLI flags. A remote attacker can add untrusted content into a Claude Code context window to execute arbitrary code.
Reliable exploitation requires the ability to introduce untrusted content into a Claude Code context window.
Remediation
Install update from vendor's website.