CVE-2026-25805: Zed Editor Information Disclosure Flaw

CVE-2026-25805 Overview

CVE-2026-25805 is a UI Design Flaw vulnerability affecting Zed, a multiplayer code editor. Prior to version 0.219.4, Zed does not display the parameters with which a tool is being invoked when asking for user allowance. Furthermore, after a tool is invoked, it does not show which parameters were actually used. This lack of transparency could allow potentially unwanted or malicious values to be used without the user having any opportunity to notice or review them.

Critical Impact

Attackers could potentially exploit hidden tool invocation parameters to execute malicious operations without user awareness, leading to potential data compromise or unauthorized actions within the code editing environment.

Affected Products

• Zed Editor versions prior to 0.219.4

Discovery Timeline

• 2026-02-10 - CVE CVE-2026-25805 published to NVD
• 2026-02-10 - Last updated in NVD database

Technical Details for CVE-2026-25805

Vulnerability Analysis

This vulnerability falls under CWE-356 (Product UI does not Warn User of Unsafe Actions), which involves scenarios where an application's user interface fails to adequately warn users about potentially dangerous operations. In the context of Zed Editor, when tools are invoked through the editor's functionality, users are asked for permission but are not shown the specific parameters that will be used during execution. This design flaw creates a significant security gap in the trust model between the application and the user.

The attack requires network access with high attack complexity, elevated privileges, and user interaction, making exploitation less trivial but still dangerous in targeted scenarios. A successful exploit could result in high impact to confidentiality, integrity, and availability of the affected system.

Root Cause

The root cause of this vulnerability stems from inadequate UI design in Zed Editor's tool invocation workflow. The application's permission dialog system was implemented without displaying the complete context of tool calls, specifically omitting the parameters that would be passed to external tools or internal functions. This design oversight meant that while users could approve or deny tool execution, they had no visibility into how those tools would actually be invoked.

Attack Vector

The attack vector is network-based and requires specific conditions to exploit. An attacker could craft malicious content or configurations that, when processed by Zed Editor, trigger tool invocations with hidden malicious parameters. Since users cannot see what parameters are being passed to tools, they might unknowingly approve dangerous operations. This could be leveraged through collaborative editing sessions, malicious project files, or compromised plugins that interact with Zed's tool system.

The vulnerability mechanism involves the tool invocation permission dialog failing to display invocation parameters. For detailed technical information, see the GitHub Security Advisory.

Detection Methods for CVE-2026-25805

Indicators of Compromise

• Unexpected tool invocations or external process executions originating from Zed Editor
• Unusual network connections initiated by Zed during collaborative editing sessions
• Unauthorized file modifications or data exfiltration occurring after tool approval dialogs

Detection Strategies

• Monitor process creation events spawned by Zed Editor for anomalous tool executions
• Implement application behavior monitoring to detect tool invocations with suspicious parameters
• Review Zed Editor logs for unexpected tool call patterns or permission requests

Monitoring Recommendations

• Deploy endpoint detection and response (EDR) solutions to monitor Zed Editor activity
• Establish baseline behavior for normal tool invocations within your development environment
• Alert on any tool executions that deviate from expected patterns in collaborative editing contexts

How to Mitigate CVE-2026-25805

Immediate Actions Required

• Upgrade Zed Editor to version 0.219.4 or later immediately
• Review recent tool invocations and project files for any suspicious activity
• Temporarily restrict collaborative editing features if upgrade is not immediately possible
• Audit any tools or plugins integrated with Zed Editor

Patch Information

Zed Industries has addressed this vulnerability in Zed Editor version 0.219.4, which includes expandable tool call details. This patch ensures that users can now see the complete parameters being passed to tools before granting permission, as well as review the parameters used after tool execution. Users should upgrade immediately through their normal update channels or by downloading the latest release from the official Zed repository.

For complete patch details, see the GitHub Security Advisory.

Workarounds

• Avoid approving tool invocations from untrusted or unfamiliar sources until upgraded
• Disable or restrict tool execution permissions within Zed Editor settings where possible
• Limit collaborative editing sessions to trusted participants until the patch is applied
• Consider using alternative code editors for sensitive projects until Zed is updated

# Verify Zed Editor version to confirm patched status
zed --version
# Expected output: 0.219.4 or higher