CVE-2026-25725— Claude Code Has Sandbox Escape via Persistent Configuration Injection in settings.json
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I. Basic Information for CVE-2026-25725
Vulnerability Information
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Vulnerability Title
Claude Code Has Sandbox Escape via Persistent Configuration Injection in settings.json
Source: NVD (National Vulnerability Database)
Vulnerability Description
Claude Code is an agentic coding tool. Prior to version 2.1.2, Claude Code's bubblewrap sandboxing mechanism failed to properly protect the .claude/settings.json configuration file when it did not exist at startup. While the parent directory was mounted as writable and .claude/settings.local.json was explicitly protected with read-only constraints, settings.json was not protected if it was missing. This allowed malicious code running inside the sandbox to create this file and inject persistent hooks (such as SessionStart commands) that would execute with host privileges when Claude Code was restarted. This issue has been patched in version 2.1.2.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
违背信任边界
Source: NVD (National Vulnerability Database)
Vulnerability Title
Claude Code 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Claude Code是Anthropic开源的一个终端原生AI编程工具。 Claude Code 2.1.2之前版本存在安全漏洞，该漏洞源于bubblewrap沙盒机制在启动时若.claude/settings.json文件不存在则未能妥善保护该文件，可能导致恶意代码创建该文件并注入持久化钩子。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| anthropics | claude-code | < 2.1.2 | - |
II. Public POCs for CVE-2026-25725
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · anthropics · 2026-02-06 · 4 CVEs total
| CVE-2026-25722 | Claude Code Vulnerable to Command Injection via Directory Change Bypasses Write Protection | |
| CVE-2026-25723 | Claude Code Vulnerable to Command Injection via Piped sed Command Bypasses File Write Rest | |
| CVE-2026-25724 | Claude Code Has Permission Deny Bypass Through Symbolic Links |
IV. Related Vulnerabilities
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Claude Code has a Workspace Trust Dialog Bypass via Repo-Con - CVE-2026-25724
Claude Code Has Permission Deny Bypass Through Symbolic Link
Same vendor: anthropics
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Claude Code: Insecure System-Wide Configuration Loading Enab - CVE-2026-34451
Claude SDK for TypeScript: Memory Tool Path Validation Allow
Same weakness: CWE-501
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