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CVE-2026-39861— Claude Code: Sandbox Escape via Symlink Following Allows Arbitrary File Write Outside Workspace

Quick assessment

Affected
anthropics claude-code
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Claude Code是Anthropic开源的一个终端原生AI编程工具。 Claude Code存在路径遍历漏洞，该漏洞源于未限制沙箱进程创建指向工作区外部的符号链接。

AI Predicted 7.8 Difficulty: Hard EPSS 0.80% · P55
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I. Basic Information for CVE-2026-39861

Vulnerability Information
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Vulnerability Title
Claude Code: Sandbox Escape via Symlink Following Allows Arbitrary File Write Outside Workspace
Source: CVE Program / CVE List V5
Vulnerability Description
Claude Code is an agentic coding tool. Prior to version 2.1.64, Claude Code's sandbox did not prevent sandboxed processes from creating symlinks pointing to locations outside the workspace. When Claude Code subsequently wrote to a path within such a symlink, its unsandboxed process followed the symlink and wrote to the target location outside the workspace without prompting the user for confirmation. This allowed a sandbox escape where neither the sandboxed command nor the unsandboxed app could independently write outside the workspace, but their combination could write to arbitrary locations, potentially leading to code execution outside the sandbox. Reliably exploiting this required the ability to add untrusted content into a Claude Code context window to trigger sandboxed code execution via prompt injection. Users on standard Claude Code auto-update have received this fix automatically. Users performing manual updates are advised to update to version 2.1.64 or later.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Claude Code 路径遍历漏洞
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存在路径遍历漏洞，该漏洞源于未限制沙箱进程创建指向工作区外部的符号链接。
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 < 2.1.64 -

II. Public POCs for CVE-2026-39861

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III. Intelligence Information for CVE-2026-39861

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IV. Related Vulnerabilities

Same product: claude-code
Same vendor: anthropics
Same weakness: CWE-22

V. Comments for CVE-2026-39861

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