File Write Vulnerability in Claude Code by Anthropic
CVE-2025-64755

8.7HIGH

Key Information:

Vendor

Anthropics

Status
Claude-code
Vendor
CVE Published:
21 November 2025

What is CVE-2025-64755?

Claude Code, an innovative coding tool by Anthropic, was found to have a vulnerability that allowed attackers to bypass read-only validation, enabling arbitrary file writes on the host system due to an error in parsing sed commands. This flaw has been addressed in the release of version 2.0.31, reinforcing security measures to prevent unauthorized file modifications.

Affected Version(s)

claude-code < 2.0.31

References

https://github.com/anthropics/claude-code/security/adviso...
x_refsource_CONFIRM

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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CVE-2025-64755 : File Write Vulnerability in Claude Code by Anthropic