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Claude Code 2.1.289 fixes critical sandbox bypass vulnerability

By PulseAugur Editorial · [1 sources] ·

Claude Code version 2.1.288 exhibited a security vulnerability where it failed to block destructive commands like `rm -rf build` when sandbox rules were set to deny or ask. This allowed the command to execute successfully in all tested instances. In contrast, version 2.1.289, released shortly after, successfully blocked these commands, indicating a fix for the vulnerability. The issue stemmed from the sandbox not correctly interpreting commands prefixed with environment variables or those preceded by bare variable assignments. AI

IMPACT Fixes a critical security flaw in Claude Code's sandbox, enhancing the safety of AI-assisted coding environments.

RANK_REASON This is a bug fix for a specific tool, not a new frontier release or significant industry event.

Read on dev.to — Claude Code tag →

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

Claude Code 2.1.289 fixes critical sandbox bypass vulnerability

How we ranked this

Signal score
29 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Tool
This is a bug fix for a specific tool, not a new frontier release or significant industry event.
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
Topics
safety, product
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AI-industry relevance
High
Clearly on-topic for AI-industry coverage.
Story freshness
Breaking (< 6h)
Fresh story with cross-source coverage still developing. Ranking may shift as more sources report.

Full methodology in our editorial standards.

COVERAGE [1]

  1. dev.to — Claude Code tag TIER_1 English(EN) · Rulestack ·

    Claude Code 2.1.288 ran TZ="$HOME" rm -rf build past sandboxed deny and ask rules 6 of 6 times; 2.1.289 stopped all 6

    <blockquote> <p>With the Bash sandbox in auto-allow mode and <code>Bash(rm *)</code> in <code>deny</code> or <code>ask</code>, Claude Code 2.1.288 ran <code>TZ="$HOME" rm -rf build</code> in 6 of 6 runs and the folder was gone every time, while 2.1.289 stopped it in 6 of 6. On 2.…

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