CVE-2026-41374: Openclaw DOS Vulnerability

CVE-2026-41374 Overview

CVE-2026-41374 is a resource exhaustion vulnerability in OpenClaw, a Node.js application that integrates with Discord. The vulnerability exists because OpenClaw performs Discord audio preflight transcription before validating member authorization, allowing unauthenticated attackers to consume server resources. Remote attackers can trigger audio preflight processing without member allowlist validation, leading to denial of service conditions through resource exhaustion.

Critical Impact

Unauthenticated attackers can exhaust server resources by triggering expensive audio transcription operations without proper authorization checks, potentially causing service degradation or denial of service.

Affected Products

• OpenClaw versions before 2026.3.31
• OpenClaw for Node.js (all platforms)
• Discord integration components with audio preflight functionality

Discovery Timeline

• 2026-04-28 - CVE CVE-2026-41374 published to NVD
• 2026-04-30 - Last updated in NVD database

Technical Details for CVE-2026-41374

Vulnerability Analysis

This vulnerability is classified under CWE-408 (Improper Handling of Exceptional Conditions), manifesting as a resource exhaustion condition in OpenClaw's Discord message handling pipeline. The core issue stems from the order of operations in the preflight audio processing workflow—specifically, the application performs computationally expensive audio transcription operations before verifying whether the requesting Discord member is authorized to interact with the system.

In vulnerable versions, when a Discord guild message containing audio content is received, the application immediately initiates the audio preflight transcription process. This transcription operation is resource-intensive, consuming CPU cycles and memory to process audio data. The authorization check against the member allowlist occurs only after this expensive operation completes, creating a window where unauthorized users can repeatedly trigger resource consumption without any rate limiting or access control.

Root Cause

The root cause is an improper ordering of security checks in the message handling pipeline. The resolveDiscordPreflightAudioMentionContext() function, which performs audio transcription, was invoked before the resolveDiscordMemberAccessState() function could validate whether the sender has permission to interact with the service. This design flaw allows any Discord user to trigger the transcription pathway regardless of their authorization status.

Attack Vector

The attack is network-based and requires no authentication or user interaction. An attacker can exploit this vulnerability by:

1. Joining a Discord guild where OpenClaw is deployed
2. Sending audio messages (voice notes) to channels monitored by OpenClaw
3. The preflight audio transcription is triggered regardless of allowlist membership
4. Repeated requests can exhaust server CPU and memory resources

The following patch demonstrates how the fix addresses this vulnerability by moving the member access validation before the expensive transcription operation:

     shouldRequireMention: shouldRequireMentionByConfig,
     bypassMentionRequirement,
   });
+  const { hasAccessRestrictions, memberAllowed } = resolveDiscordMemberAccessState({
+    channelConfig,
+    guildInfo,
+    memberRoleIds,
+    sender,
+    allowNameMatching,
+  });
+
+  if (isGuildMessage && hasAccessRestrictions && !memberAllowed) {
+    logDebug(`[discord-preflight] drop: member not allowed`);
+    // Keep stable Discord user IDs out of routine deny-path logs.
+    logVerbose("Blocked discord guild sender (not in users/roles allowlist)");
+    return null;
+  }
 
-  // Preflight audio transcription for mention detection in guilds.
-  // This allows voice notes to be checked for mentions before being dropped.
+  // Only authorized guild senders should reach the expensive transcription path.
   const { hasTypedText, transcript: preflightTranscript } =
     await resolveDiscordPreflightAudioMentionContext({
       message,

Source: GitHub Commit

Detection Methods for CVE-2026-41374

Indicators of Compromise

• Unusual spikes in CPU utilization on servers running OpenClaw
• Elevated memory consumption during Discord message processing
• High volume of audio transcription requests from unauthorized Discord users
• Log entries showing frequent audio preflight operations without corresponding authorized actions

Detection Strategies

• Monitor application logs for repeated [discord-preflight] operations from users not in the allowlist
• Implement alerting for abnormal resource consumption patterns on OpenClaw instances
• Review Discord message processing metrics for unexpected increases in audio transcription requests
• Analyze network traffic for patterns indicating automated audio message submission

Monitoring Recommendations

• Configure resource monitoring dashboards to track CPU and memory usage on OpenClaw servers
• Set up log aggregation to identify repeated unauthorized access attempts to audio processing endpoints
• Implement rate limiting monitoring to detect potential abuse patterns
• Enable verbose logging temporarily to identify the source of unauthorized transcription requests

How to Mitigate CVE-2026-41374

Immediate Actions Required

• Upgrade OpenClaw to version 2026.3.31 or later immediately
• Review Discord guild configurations to ensure allowlists are properly configured
• Monitor server resources for signs of ongoing exploitation
• Consider temporarily disabling audio preflight functionality if immediate patching is not possible

Patch Information

The vulnerability has been addressed in OpenClaw version 2026.3.31. The fix reorders the authentication logic to validate member access through resolveDiscordMemberAccessState() before invoking the expensive resolveDiscordPreflightAudioMentionContext() transcription function. The patch is available via the GitHub commit ee52f64. For complete details, refer to the GitHub Security Advisory GHSA-hhff-fj5f-qg48.

Workarounds

• Restrict Discord guild access to trusted members only until patching is complete
• Implement external rate limiting on the OpenClaw service to limit the impact of resource exhaustion attacks
• Configure Discord channel permissions to limit who can send audio messages
• Deploy resource quotas or containerization limits to prevent complete service exhaustion

# Configuration example - Restrict Discord channel audio permissions
# In Discord server settings, limit voice message permissions to trusted roles
# Additionally, implement resource limits if running in containers:
docker run --memory="512m" --cpus="1.0" openclaw/openclaw:2026.3.31