Mesop Class Pollution vulnerability leads to DoS and Jailbreak attacks
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.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | mesop | < 0.14.1 | 0.14.1 |
Referencias
- https://github.com/mesop-dev/mesop/security/advisories/GHSA-f3mf-hm6v-jfhh
- https://nvd.nist.gov/vuln/detail/CVE-2025-30358
- https://github.com/mesop-dev/mesop/commit/748e20d4a363d89b841d62213f5b0c6b4bed788f
- https://github.com/mesop-dev/mesop
- https://pypi.org/project/mesop
- https://github.com/advisories/GHSA-f3mf-hm6v-jfhh
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H- Debilidad (CWE)
CWE-915- Plataforma
- Python (PyPI)
- Paquete
mesop- Publicada
- 27.03.2025
- Actualizado
- 11.10.2026 13:18
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2026-1624 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-f3mf-hm6v-jfhh - CC BY 4.0
Historial de vulnerabilidades: mesop
Todas las vulnerabilidades publicadas de este paquete (Python (PyPI)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 6
- Primera → última
- 09.2024 09.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 2
- Alta 3
- Media 1
Divulgaciones por año
- 2024: 1
- 2025: 1
- 2026: 4
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Mesop Class Pollution vulnerability leads to DoS and Jailbreak attacks esta entrada
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