OS Command Injection in Claude Code - CVE-2025-64755
Published: April 30, 2026
Vulnerability identifier: #VU128522
CSH Severity: High
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2025-64755
CWE-ID: CWE-78
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Claude Code
Claude Code
Software vendor:
Anthropic
Anthropic
Description
The vulnerability allows a remote attacker to write to arbitrary files on the host system.
The vulnerability exists due to improper neutralization of special elements used in an os command in sed command parsing when processing sed commands. A remote attacker can bypass the read-only validation to write to arbitrary files on the host system.
User interaction is required.
Remediation
Install security update from vendor's website.