CVE-2026-55531mediumCWE-400CWE-770

CVE-2026-55531: medium-severity vulnerability in MervinPraison PraisonAI

PraisonAI: Unauthenticated unbounded session accumulation in the PraisonAI MCP HTTP server (memory exhaustion; session TTL never enforced)

Published

Follow this CVE+ Monitor PraisonAI+ Monitor praisonai

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 6.5epss 0.5%
PraisonAI is a multi-agent teams system. Prior to praisonai 4.6.58, the MCP HTTP Stream mcp_post handler creates a new _sessions entry for every initialize request but does not call _cleanup_sessions or enforce a maximum. An unauthenticated caller can exhaust memory. The fix invokes cleanup and limits sessions through PRAISONAI_MCP_MAX_SESSIONS. This issue is fixed in version 4.6.58.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Affected products
MervinPraison · PraisonAI
Related CVEs — MervinPraison PraisonAI

In the same product, most dangerous first.

CVE-2026-44338HIGHPraisonAI ships and generates a legacy API server with authentication disabled by default, allowing unauthenticated workflow executionEPSS 32.6%CVE-2026-61447CRITICALPraisonAI before 1.6.78 Remote Code Execution via CodeAgentEPSS 15.2%CVE-2026-34938CRITICALPraisonAI: Python Sandbox Escape via str Subclass startswith() Override in execute_codeEPSS 13.4%CVE-2026-48168CRITICALPraisonAI: GitHub Actions Claude workflow command injection via unquoted PR branch nameEPSS 1.5%CVE-2026-47391CRITICALPraisonAI's unauthenticated A2A official example can reach real LLM-driven `eval()` tool executionEPSS 1.5%CVE-2026-57124CRITICALPraisonAI UI MCP connect endpoint allows unauthenticated local command executionEPSS 1.0%