Vulnerability Details CVE-2026-34939
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 13.7%
CVSS Severity
CVSS v3 Score 6.5