BaseFortify

Publication date: 2025-11-21

Last updated on: 2025-12-04

Assigner: GitHub, Inc.

Description

Claude Code is an agentic coding tool. Prior to version 2.0.31, due to an error in sed command parsing, it was possible to bypass the Claude Code read-only validation and write to arbitrary files on the host system. This issue has been patched in version 2.0.31.

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-11-21

Last Modified

2025-12-04

Generated

2026-07-06

AI Q&A

2025-11-21

EPSS Evaluated

2026-07-04

NVD

CVE-2025-64755

Affected Vendors & Products

Vendor	Product	Version / Range
anthropic	claude_code	to 2.0.31 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-78	The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

Attack-Flow Graph

Executive Summary

This vulnerability in Claude Code, prior to version 2.0.31, is due to an error in sed command parsing that allowed attackers to bypass the read-only validation mechanism. As a result, it was possible to write to arbitrary files on the host system, which should have been protected from modification.

Impact Analysis

The vulnerability can allow an attacker to modify arbitrary files on the host system without proper authorization. This can lead to unauthorized changes, potential system compromise, data corruption, or the introduction of malicious code, thereby impacting system integrity and security.

Mitigation Strategies

Upgrade Claude Code to version 2.0.31 or later, as this version contains the patch that fixes the sed command parsing error allowing arbitrary file writes.

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