QwikSec

Security Database

CVE

CWE

Training

CVE Database
/

CVE-2026-34939

Back to search

CVE-2026-34939

Published: Apr 3, 2026

Modified: Apr 6, 2026

PUBLISHED

CVSS v3.1

6.5

MEDIUM

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.

VendorProductVersions

MervinPraison

PraisonAI

affected
< 4.5.90

Weaknesses (CWE)

CWE-1333

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

References

Security Training

Train your team to recognize and prevent security threats with our comprehensive security awareness program.

Start Training

Vulnerability Scanning

Discover vulnerabilities in your applications and infrastructure before attackers do.

Scan Now