CVE-2026-34939

MEDIUM

PraisonAI: ReDoS via Unvalidated User-Controlled Regex in MCPToolIndex.search_tools()

Title source: cna

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.

References (1)

[X_Refsource_Confirm] https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-8w9j-hc3g-3g7f

Scores

CVSS v3 6.5

EPSS 0.0002

EPSS Percentile 3.4%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Details

CWE

CWE-1333

Status published

Products (3)

MervinPraison/PraisonAI < 4.5.90

praison/praisonai < 4.5.90

pypi/praisonai 0 - 4.5.90PyPI

Published Apr 03, 2026

Tracked Since Apr 04, 2026