Compliance Impact

The vulnerability allows arbitrary command execution on a user's machine by bypassing the terminal tool permission system in Zed. This can lead to significant impacts on confidentiality, integrity, and availability of data.

Such impacts could potentially affect compliance with common standards and regulations like GDPR and HIPAA, which require protection of sensitive data and system integrity. If exploited, this vulnerability might lead to unauthorized data access or modification, violating these regulatory requirements.

However, the provided information does not explicitly mention compliance implications or specific regulatory impacts.

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Executive Summary

The vulnerability CVE-2026-44466 affects Zed's terminal tool permission system by allowing an allowlist bypass through Bash arithmetic expansion syntax $((...)).

Zed uses a regex pattern to allow certain commands like 'echo', but this pattern does not account for commands nested inside the $((...)) syntax.

Attackers can embed arbitrary commands inside this syntax, for example: echo $(( $(curl -s https://google.com | wc -l) )), which bypasses the allowlist and executes the nested command.

This means that even if only 'echo' is allowed, an attacker can execute other commands by nesting them inside the arithmetic expansion.

The vulnerability is fixed in Zed version 0.229.0.

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Impact Analysis

This vulnerability allows an attacker to execute arbitrary commands on a user's machine if they can influence AI agent tool calls, such as through prompt injection.

The attack requires local access, low complexity, no privileges, and user interaction.

Successful exploitation can lead to significant impacts on confidentiality, integrity, and availability of the affected system.

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Detection Guidance

This vulnerability involves bypassing Zed's terminal tool permission system via Bash arithmetic expansion $((...)) inside allowlisted commands like echo.

To detect exploitation attempts on your system, you can monitor command executions that include suspicious use of the $((...)) syntax nested inside allowlisted commands.

• Use shell history or audit logs to search for commands matching patterns like: echo $(( ... ))
• Example command to search bash history for suspicious patterns: grep -E 'echo \$\(\(' ~/.bash_history
• Use system auditing tools (e.g., auditd) to log and review executions of allowlisted commands with nested arithmetic expansions.

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Mitigation Strategies

The primary mitigation is to upgrade Zed to version 0.229.0 or later, where this vulnerability has been fixed.

Until the upgrade is applied, avoid relying solely on allowlists for terminal commands in Zed, as they can be bypassed via the described method.

Additionally, restrict local access to trusted users only, since the attack requires local access and user interaction.

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