---
title: "Discussion on \"How to Check If Your Claude Code Installation Is Affected by CVE-2026-39861 (CVSS 7.7)\" | Hashnode"
description: "Discussion on \"How to Check If Your Claude Code Installation Is Affected by CVE-2026-39861 (CVSS 7.7)\". CVE-2026-39861 is a sandbox escape in Claude Code, patched in version 2.1.64. The vulnerability allows file writes to land outside the workspace directory by exploiting symbolic link following across"
url: "https://hashnode.com/posts/how-to-check-if-your-claude-code-installation-is-affected-by-cve-2026-39861-cvss-7-7/69fd4b919f93a850a44dc09a"
---

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# [How to Check If Your Claude Code Installation Is Affected by CVE-2026-39861 (CVSS 7.7)](https://armor1.hashnode.dev/how-to-check-if-your-claude-code-installation-is-affected-by-cve-2026-39861-cvss-7-7?utm_source=hashnode&utm_medium=feed)

CVE-2026-39861 is a sandbox escape in Claude Code, patched in version 2.1.64. The vulnerability allows file writes to land outside the workspace directory by exploiting symbolic link following across

May 8 · 3 min read · armor1.hashnode.dev  
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[Armor1](https://hashnode.com/@armor1)

@armor1 · San Francisco, USA

  
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