CVE-2026-34824 HIGH

CVE-2026-34824: Mesop: Unbounded Thread Creation in WebSocket Handler Leads to Denial of Service

Vendor Mesop-Dev
Product mesop
Weakness CWE-125
Published April 3, 2026
Last update April 6, 2026

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

Mesop is a Python-based UI framework that allows users to build web applications. From version 1.2.3 to before version 1.2.5, an uncontrolled resource consumption vulnerability exists in the WebSocket implementation of the Mesop framework. An unauthenticated attacker can send a rapid succession of WebSocket messages, forcing the server to spawn an unbounded number of operating system threads. This leads to thread exhaustion and Out of Memory (OOM) errors, causing a complete Denial of Service (DoS) for any application built on the framework. This issue has been patched in version 1.2.5.

Key dates

02Disclosure timeline

April 3, 2026 CVE published
April 6, 2026 Record updated