# CVE-2023-47641: python-aiohttp: aiohttp is an asynchronous HTTP client/server framework for asyncio and Python

CVE-2023-47641 is fixed in python-aiohttp on 1 platform, first by DEBIAN-CVE-2023-47641, released November 14, 2023. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-47641
- Priority: Routine
- CVSS: 6.5 (medium)
- EPSS: 0.0083
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 14, 2023

## Description

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Affected versions of aiohttp have a security vulnerability regarding the inconsistent interpretation of the http protocol. HTTP/1.1 is a persistent protocol, if both Content-Length(CL) and Transfer-Encoding(TE) header values are present it can lead to incorrect interpretation of two entities that parse the HTTP and we can poison other sockets with this incorrect interpretation. A possible Proof-of-Concept (POC) would be a configuration with a reverse proxy(frontend) that accepts both CL and TE headers and aiohttp as backend. As aiohttp parses anything with chunked, we can pass a chunked123 as TE, the frontend entity will ignore this header and will parse Content-Length. The impact of this vulnerability is that it is possible to bypass any proxy rule, poisoning sockets to other users like passing Authentication Headers, also if it is present an Open Redirect an attacker could combine it to redirect random users to another website and log the request. This vulnerability has been addressed in release 3.8.0 of aiohttp. Users are advised to upgrade. There are no known workarounds for this vulnerability.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | python-aiohttp Debian 12.15 (bookworm) | 3.8.1-1 | [DEBIAN-CVE-2023-47641](https://patchblox.com/security/data/fix/linux/debian-cve-2023-47641.md) | Nov 14, 2023 |
| Linux | python-aiohttp Debian 13.5 (trixie) | 3.8.1-1 | [DEBIAN-CVE-2023-47641](https://patchblox.com/security/data/fix/linux/debian-cve-2023-47641.md) | Nov 14, 2023 |
| Linux | python-aiohttp Debian 14 | 3.8.1-1 | [DEBIAN-CVE-2023-47641](https://patchblox.com/security/data/fix/linux/debian-cve-2023-47641.md) | Nov 14, 2023 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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