CVE-2026-34953 MervinPraison CVE debrief

Who should care

Users of PraisonAI, especially those with exposed MCP servers, should prioritize upgrading to version 4.5.97 or later to mitigate this critical vulnerability. Security teams and operators managing PraisonAI deployments should review system configurations and ensure that access controls are in place.

Technical summary

The OAuthManager.validate_token() function in PraisonAI's MCP server has a critical vulnerability. By default, its internal token store is empty, causing the function to return True for any provided Bearer token. This allows unauthenticated access to all tools and agent capabilities. The vulnerability is patched in version 4.5.97. Affected systems should be upgraded to prevent unauthorized access.

Defensive priority

High

Recommended defensive actions

• Upgrade PraisonAI to version 4.5.97 or later
• Review and restrict access to MCP server
• Monitor for suspicious activity
• Implement additional authentication mechanisms
• Review compensating controls for exposed systems
• Track exceptions and retest remediated assets
• Confirm whether affected product deployments exist in managed environments

Evidence notes

The CVE record and NVD detail provide information on the vulnerability. The vendor advisory on GitHub offers mitigation guidance. Evidence is limited to public sources and may not reflect the full scope or impact of the vulnerability. Defenders should verify affected systems and apply patches or mitigations as recommended by the vendor.

Official resources