CVE-2026-34939
MEDIUM
NVD
CVSS Score
6.5
Severity
MEDIUM
Published
Apr 03, 2026
Vendor
unknown
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.