aiohttp's ClientSession is vulnerable to CRLF injection via method
Summary
Improper validation makes it possible for an attacker to modify the HTTP request (e.g. insert a new header) or even create a new HTTP request if the attacker controls the HTTP method.
Details
The vulnerability occurs only if the attacker can control the HTTP method (GET, POST etc.) of the request.
Previous releases performed no validation on the provided value. If an attacker controls the HTTP method it will be used as is and can lead to HTTP request smuggling.
PoC
A minimal example can be found here: https://gist.github.com/jnovikov/7f411ae9fe6a9a7804cf162a3bdbb44b
Impact
If the attacker can control the HTTP version of the request it will be able to modify the request (request smuggling).
Workaround
If unable to upgrade and using user-provided values for the request method, perform manual validation of the user value (e.g. by restricting it to a few known values like GET, POST etc.).
Software afectado
Haz clic en una tecnología para ver todas sus vulnerabilidades.
| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | aiohttp | < 3.9.0 | 3.9.0 |
Referencias
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-qvrw-v9rv-5rjx
- https://gist.github.com/jnovikov/7f411ae9fe6a9a7804cf162a3bdbb44b
- https://github.com/aio-libs/aiohttp/pull/7806/files
- https://github.com/aio-libs/aiohttp/commit/e4ae01c2077d2cfa116aa82e4ff6866857f7c466
- https://nvd.nist.gov/vuln/detail/CVE-2023-49082
- https://github.com/aio-libs/aiohttp
- https://github.com/pypa/advisory-database/tree/main/vulns/aiohttp/PYSEC-2023-251.yaml
- https://lists.debian.org/debian-lts-announce/2025/02/msg00002.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TY5SI6NK5243DEEDQUFKQKW5GQNKQUMA
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WSYWMP64ZFCTC3VO6RY6EC6VSSMV6I3A
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N- Debilidad (CWE)
CWE-20- Plataforma
- Python (PyPI)
- Paquete
aiohttp- Publicada
- 27.11.2023
- Actualizado
- 11.10.2026 15:17
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2023-251 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-qvrw-v9rv-5rjx - CC BY 4.0
Historial de vulnerabilidades: aiohttp
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
- 55
- Primera → última
- 02.2021 10.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Alta 7
- Media 29
- Baja 19
Divulgaciones por año
- 2021: 1
- 2022: 0
- 2023: 6
- 2024: 7
- 2025: 1
- 2026: 40
-
aiohttp's ClientSession is vulnerable to CRLF injection via method esta entrada
Identifica las vulnerabilidades de tu aplicación
Con la integración de DockRay y el inventario de software activado, DockRay compara las versiones notificadas de los componentes con las vulnerabilidades conocidas y avisa de las coincidencias confirmadas. La cobertura depende de la tecnología compatible y de los avisos disponibles.