CVE-2026-41396: OpenClaw Plugin Trust Vulnerability

CVE-2026-41396 Overview

OpenClaw before version 2026.3.31 contains a vulnerability that allows workspace .env files to override the OPENCLAW_BUNDLED_PLUGINS_DIR environment variable, effectively compromising the plugin trust verification mechanism. Attackers with control over workspace configuration can inject malicious plugins by overriding the bundled plugin trust root directory, potentially leading to arbitrary code execution within the context of the OpenClaw application.

Critical Impact

This vulnerability enables attackers to bypass plugin trust verification by manipulating environment variables through workspace configuration files, allowing malicious plugin injection and potential code execution.

Affected Products

• OpenClaw versions prior to 2026.3.31

Discovery Timeline

• 2026-04-28 - CVE-2026-41396 published to NVD
• 2026-04-28 - Last updated in NVD database

Technical Details for CVE-2026-41396

Vulnerability Analysis

This vulnerability falls under CWE-829 (Inclusion of Functionality from Untrusted Control Sphere), representing an insecure default configuration and improper input validation issue. The flaw stems from OpenClaw's failure to properly protect security-critical environment variables from being overridden by workspace-level .env files.

The attack requires local access and user interaction, meaning an attacker would need to convince a user to open a malicious workspace or gain access to modify workspace configuration files. Once exploited, the vulnerability can compromise the confidentiality, integrity, and availability of the affected system by allowing execution of untrusted plugins with the privileges of the OpenClaw process.

Root Cause

The root cause lies in OpenClaw's dotenv configuration handling within src/infra/dotenv.ts. The application failed to include OPENCLAW_BUNDLED_PLUGINS_DIR in the list of protected environment variables that cannot be overridden by workspace-level configuration files. This oversight allowed malicious workspace configurations to redirect the plugin trust root to an attacker-controlled directory.

Attack Vector

The attack vector is local, requiring an attacker to either:

1. Create a malicious workspace with a crafted .env file containing a modified OPENCLAW_BUNDLED_PLUGINS_DIR path
2. Modify an existing workspace's .env file to point to a directory containing malicious plugins
3. Distribute a project repository containing a malicious .env configuration

When a victim opens the compromised workspace, OpenClaw loads the malicious environment configuration, overriding the legitimate bundled plugins directory with the attacker-controlled path. The application then treats plugins from this directory as trusted, bypassing normal verification mechanisms.

The security patch adds OPENCLAW_BUNDLED_PLUGINS_DIR along with related variables to the blocklist of environment variables that cannot be overridden by workspace .env files:

   "NODE_TLS_REJECT_UNAUTHORIZED",
   "NO_PROXY",
   "OPENCLAW_AGENT_DIR",
+  "OPENCLAW_BUNDLED_HOOKS_DIR",
   "OPENCLAW_BUNDLED_PLUGINS_DIR",
+  "OPENCLAW_BUNDLED_SKILLS_DIR",
   "OPENCLAW_CONFIG_PATH",
   "OPENCLAW_GATEWAY_PASSWORD",
   "OPENCLAW_GATEWAY_SECRET",

Source: GitHub Commit Update

Detection Methods for CVE-2026-41396

Indicators of Compromise

• Workspace .env files containing OPENCLAW_BUNDLED_PLUGINS_DIR, OPENCLAW_BUNDLED_HOOKS_DIR, or OPENCLAW_BUNDLED_SKILLS_DIR variable overrides
• Unexpected plugin directories being referenced outside of standard OpenClaw installation paths
• Unsigned or unverified plugins loaded from non-standard locations
• Anomalous process behavior or network connections initiated by OpenClaw

Detection Strategies

• Monitor workspace configuration files for modifications to security-critical environment variables
• Implement file integrity monitoring on OpenClaw configuration directories and plugin paths
• Review OpenClaw process execution for plugins loaded from unexpected directories
• Audit version control repositories for suspicious .env file additions or modifications

Monitoring Recommendations

• Enable logging for environment variable loading and plugin initialization within OpenClaw
• Configure endpoint detection and response (EDR) solutions to alert on OpenClaw loading plugins from non-standard paths
• Implement code review requirements for workspace configuration changes in shared repositories

How to Mitigate CVE-2026-41396

Immediate Actions Required

• Update OpenClaw to version 2026.3.31 or later immediately
• Review existing workspaces for suspicious .env file configurations containing plugin directory overrides
• Remove or quarantine any untrusted workspace configurations
• Audit recently opened workspaces for signs of compromise

Patch Information

The security fix has been implemented in commit 330a9f98cb29c79b1c16a2117e03d6276a0d6289. This patch adds OPENCLAW_BUNDLED_PLUGINS_DIR, OPENCLAW_BUNDLED_HOOKS_DIR, and OPENCLAW_BUNDLED_SKILLS_DIR to the blocklist of environment variables that workspace .env files cannot override. Organizations should upgrade to OpenClaw version 2026.3.31 or later.

For detailed patch information, see the GitHub Security Advisory and VulnCheck Advisory.

Workarounds

• Manually review all .env files in workspaces before opening, removing any OPENCLAW_BUNDLED_* variable overrides
• Configure operating system-level protections to prevent environment variable override for critical paths
• Use application allowlisting to restrict which plugins can be loaded by OpenClaw

# Check workspaces for suspicious environment variable overrides
grep -r "OPENCLAW_BUNDLED_PLUGINS_DIR\|OPENCLAW_BUNDLED_HOOKS_DIR\|OPENCLAW_BUNDLED_SKILLS_DIR" ~/.openclaw/workspaces/*/.env