Request smuggling leading to endpoint restriction bypass in Gunicorn
Gunicorn fails to properly validate Transfer-Encoding headers, leading to HTTP Request Smuggling (HRS) vulnerabilities. By crafting requests with conflicting Transfer-Encoding headers, attackers can bypass security restrictions and access restricted endpoints. This issue is due to Gunicorn's handling of Transfer-Encoding headers, where it incorrectly processes requests with multiple, conflicting Transfer-Encoding headers, treating them as chunked regardless of the final encoding specified. This vulnerability has been shown to allow access to endpoints restricted by gunicorn. This issue has been addressed in version 22.0.0.
To be affected users must have a network path which does not filter out invalid requests. These users are advised to block access to restricted endpoints via a firewall or other mechanism if they are unable to update.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | gunicorn | < 22.0.0 | 22.0.0 |
Referencias
- https://nvd.nist.gov/vuln/detail/CVE-2024-1135
- https://github.com/benoitc/gunicorn/issues/3091
- https://github.com/benoitc/gunicorn/pull/3113
- https://github.com/benoitc/gunicorn/commit/ac29c9b0a758d21f1e0fb3b3457239e523fa9f1d
- https://github.com/benoitc/gunicorn
- https://github.com/benoitc/gunicorn/releases/tag/22.0.0
- https://huntr.com/bounties/22158e34-cfd5-41ad-97e0-a780773d96c1
- https://lists.debian.org/debian-lts-announce/2024/06/msg00027.html
- https://lists.debian.org/debian-lts-announce/2024/12/msg00018.html
- https://pypi.org/project/gunicorn
- https://github.com/advisories/GHSA-w3h3-4rj7-4ph4
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N- Debilidad (CWE)
CWE-444- Plataforma
- Python (PyPI)
- Paquete
gunicorn- Publicada
- 16.04.2024
- Actualizado
- 11.10.2026 15:17
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2026-1434 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-w3h3-4rj7-4ph4 - CC BY 4.0
Historial de vulnerabilidades: gunicorn
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
- 3
- Primera → última
- 04.2018 03.2025
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Alta 3
Divulgaciones por año
- 2018: 1
- 2019: 0
- 2020: 0
- 2021: 0
- 2022: 0
- 2023: 0
- 2024: 1
- 2025: 1
- 2026: 0
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Request smuggling leading to endpoint restriction bypass in Gunicorn esta entrada
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