Lacking Protection against HTTP Request Smuggling in mitmproxy
Impact
In mitmproxy 7.0.2 and below, a malicious client or server is able to perform HTTP request smuggling attacks through mitmproxy. This means that a malicious client/server could smuggle a request/response through mitmproxy as part of another request/response's HTTP message body. While mitmproxy would only see one request, the target server would see multiple requests. A smuggled request is still captured as part of another request's body, but it does not appear in the request list and does not go through the usual mitmproxy event hooks, where users may have implemented custom access control checks or input sanitization.
Unless you use mitmproxy to protect an HTTP/1 service, no action is required.
Patches
The vulnerability has been fixed in mitmproxy 7.0.3 and above.
Acknowledgements
We thank João Sobral (@chinchila) for responsibly disclosing this vulnerability to the mitmproxy team.
Timeline
- 2021-09-08: Received initial report for mitmproxy <= 6.0.2.
- 2021-09-08: Requested clarification if 7.x is affected.
- 2021-09-10: Received additional details, 7.x situation still unclear.
- 2021-09-13: Internally determined that 7.x is also affected.
- 2021-09-13: Shared initial fix with researcher.
- 2021-09-14: Received confirmation that fix is working, but H2.TE/H2.CL should also be looked at.
- 2021-09-14: Shared revised fix that includes additional H2.TE mitigations.
- 2021-09-14: Received confirmation that revised fix is working.
- 2021-09-16: Completed internal patch review.
- 2021-09-16: Published patch release and advisory.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | mitmproxy | < 7.0.3 | 7.0.3 |
Referencias
- Vector CVSS
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H- Debilidad (CWE)
CWE-444- Plataforma
- Python (PyPI)
- Paquete
mitmproxy- Publicada
- 16.09.2021
- Actualizado
- 11.10.2026 13:19
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2021-328 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-22gh-3r9q-xf38 - CC BY 4.0
Historial de vulnerabilidades: mitmproxy
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
- 07.2018 04.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 3
- Alta 1
- Media 2
Divulgaciones por año
- 2018: 1
- 2019: 0
- 2020: 0
- 2021: 1
- 2022: 1
- 2023: 0
- 2024: 0
- 2025: 2
- 2026: 1
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Lacking Protection against HTTP Request Smuggling in mitmproxy esta entrada
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