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Claude Code vulnerable to sandbox escape; update to 2.1.64

By PulseAugur Editorial · [1 sources] ·

A critical sandbox escape vulnerability, CVE-2026-39861, has been identified in Claude Code, affecting versions prior to 2.1.64. The flaw allows malicious actors to write files outside the designated workspace by exploiting symbolic link following between processes. Security researchers reported the issue, and users are urged to update to the latest version to mitigate the risk. AI

IMPACT Highlights the ongoing security challenges and attack vectors present in agentic execution models that combine filesystem access with autonomous operation.

RANK_REASON Security advisory for a specific software product, not a core AI model release or research.

Read on dev.to — Claude Code tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Claude Code vulnerable to sandbox escape; update to 2.1.64

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Security advisory for a specific software product, not a core AI model release or research.
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  1. dev.to — Claude Code tag TIER_1 English(EN) · Armor1 ·

    How to Check If Your Claude Code Installation Is Affected by CVE-2026-39861 (CVSS 7.7)

    <p>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 two Claude Code processes. Reported by security researcher philts via HackerO…

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