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CVE-2025-30358— Mesop Class Pollution vulnerability leads to DoS and Jailbreak attacks

Quick assessment

Affected
mesop-dev mesop
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Google Mesop是美国谷歌（Google）公司的一个基于 Python 的 UI 框架。 Google Mesop 0.14.1之前版本存在安全漏洞，该漏洞源于类污染可能导致拒绝服务或其他严重后果。

CVSS 8.1 · High EPSS 0.69% · P50
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I. Basic Information for CVE-2025-30358

Vulnerability Information
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Vulnerability Title
Mesop Class Pollution vulnerability leads to DoS and Jailbreak attacks
Source: CVE Program / CVE List V5
Vulnerability Description
Mesop is a Python-based UI framework that allows users to build web applications. A class pollution vulnerability in Mesop prior to version 0.14.1 allows attackers to overwrite global variables and class attributes in certain Mesop modules during runtime. This vulnerability could directly lead to a denial of service (DoS) attack against the server. Additionally, it could also result in other severe consequences given the application's implementation, such as identity confusion, where an attacker could impersonate an assistant or system role within conversations. This impersonation could potentially enable jailbreak attacks when interacting with large language models (LLMs). Just like the Javascript's prototype pollution, this vulnerability could leave a way for attackers to manipulate the intended data-flow or control-flow of the application at runtime and lead to severe consequences like remote code execution when gadgets are available. Users should upgrade to version 0.14.1 to obtain a fix for the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-915
Source: CVE Program / CVE List V5
Vulnerability Title
Google Mesop 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google Mesop是美国谷歌（Google）公司的一个基于 Python 的 UI 框架。 Google Mesop 0.14.1之前版本存在安全漏洞，该漏洞源于类污染可能导致拒绝服务或其他严重后果。
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 < 0.14.1 -

II. Public POCs for CVE-2025-30358

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 6196 chars
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III. Intelligence Information for CVE-2025-30358

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Patches & Fixes for CVE-2025-30358 (1)

Vendor Advisories for CVE-2025-30358 (1)

IV. Related Vulnerabilities

Same product: mesop
Same vendor: mesop-dev
Same weakness: CWE-915

V. Comments for CVE-2025-30358

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