CVE-2026-34939 — PraisonAI: ReDoS via Unvalidated User-Controlled Regex in MCPToolIndex.search_tools()
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 v…
Published: 2026-04-03 · CVSS: 6.5 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7