HIGH 8.1 PyPI

Mesop Class Pollution vulnerability leads to DoS and Jailbreak attacks

GHSA-f3mf-hm6v-jfhh · CVE-2025-30358 · PYSEC-2026-1624

Published · Modified

AI SAST

Find this class of vulnerability in your own code

Corgea's AI-native static analysis detects vulnerabilities like this one across your repositories, ranks them by exploitability, and returns review-ready fixes.

Description

From @jackfromeast and @superboy-zjc:
We have identified a class pollution vulnerability in Mesop (<= 0.14.0) application that 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 consequnces like RCE when gadgets are available.

Ready to move

Start Securing

Free, no credit card | First findings in minutes