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

Quick assessment

Affected
mesop-dev mesop
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mesop是Mesop开源的一个快速构建Python Web应用的UI框架。 Mesop 1.2.3至1.2.5之前版本存在安全漏洞，该漏洞源于WebSocket实现存在不受控制的资源消耗问题，可能导致未经身份验证的攻击者通过快速发送消息耗尽线程和内存，造成拒绝服务。

CVSS 7.5 · High EPSS 0.72% · P51
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I. Basic Information for CVE-2026-34824

Vulnerability Information
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Vulnerability Title
Mesop: Unbounded Thread Creation in WebSocket Handler Leads to Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Mesop 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mesop是Mesop开源的一个快速构建Python Web应用的UI框架。 Mesop 1.2.3至1.2.5之前版本存在安全漏洞，该漏洞源于WebSocket实现存在不受控制的资源消耗问题，可能导致未经身份验证的攻击者通过快速发送消息耗尽线程和内存，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
mesop-dev mesop >= 1.2.3, < 1.2.5 -

II. Public POCs for CVE-2026-34824

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III. Intelligence Information for CVE-2026-34824

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IV. Related Vulnerabilities

Same product: mesop
Same vendor: mesop-dev
Same weakness: CWE-125

V. Comments for CVE-2026-34824

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