VULNERABILITY INTELLIGENCE

CVE-2026-34939

CVSS score7.5 HIGH

EPSS probability0.42%

CISA KEVNot currently listed

Published2026-04-03

Last modified2026-07-24

Description

PraisonAI is a multi-agent teams system. Prior to version 4.5.90, MCPToolIndex.search_tools() compiles a caller-supplied string directly as a Python regular expression with no validation, sanitization, or timeout. A crafted regex causes catastrophic backtracking in the re engine, blocking the Python thread for hundreds of seconds and causing a complete service outage. This issue has been patched in version 4.5.90.