CVE-2026-55531: CWE-400: Uncontrolled Resource Consumption in MervinPraison PraisonAI
Description
CVE-2026-55531 is an uncontrolled resource consumption vulnerability in MervinPraison's PraisonAI multi-agent teams system. Prior to version 4.6.58, the MCP HTTP Stream mcp_post handler creates a new session entry for every initialize request without cleaning up old sessions or enforcing a maximum limit. This allows an unauthenticated attacker to exhaust memory resources. The issue is fixed in version 4.6.58 by invoking session cleanup and limiting the number of sessions via PRAISONAI_MCP_MAX_SESSIONS.
CVSS v3.1
Score 6.5medium
Affected software
MervinPraison
PraisonAI
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
PraisonAI versions before 4.6.58 contain a resource exhaustion vulnerability (CWE-400) in the MCP HTTP Stream mcp_post handler. Each initialize request creates a new _sessions entry without calling the _cleanup_sessions function or enforcing a maximum session count. An unauthenticated attacker can exploit this to exhaust system memory, causing denial of service. The vulnerability is addressed in version 4.6.58 by adding session cleanup and limiting sessions through the PRAISONAI_MCP_MAX_SESSIONS configuration.
Potential Impact
An unauthenticated attacker can cause denial of service by exhausting memory resources on the affected PraisonAI system. There is no impact on confidentiality or integrity, but availability is severely affected due to uncontrolled resource consumption.
Mitigation Recommendations
Upgrade PraisonAI to version 4.6.58 or later, where the vulnerability is fixed by invoking session cleanup and limiting the maximum number of sessions. No other mitigation is required as the fix is official and complete.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-16T23:01:04.073Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a8dac49acd9273b4955690b
Added to database: 08/25/2026, 14:52:57 UTC
Last enriched: 09/10/2026, 18:25:18 UTC
Last updated: 10/08/2026, 06:48:18 UTC
Views: 81
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