CVE-2025-53643 – aiohttp

Package

Manager: pip
Name: aiohttp
Vulnerable Version: >=0 <3.12.14

Severity

Level: Low

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U

EPSS: 0.00044 pctl0.12212

Details

AIOHTTP is vulnerable to HTTP Request/Response Smuggling through incorrect parsing of chunked trailer sections ### Summary The Python parser is vulnerable to a request smuggling vulnerability due to not parsing trailer sections of an HTTP request. ### Impact If a pure Python version of aiohttp is installed (i.e. without the usual C extensions) or AIOHTTP_NO_EXTENSIONS is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections. ---- Patch: https://github.com/aio-libs/aiohttp/commit/e8d774f635dc6d1cd3174d0e38891da5de0e2b6a

Metadata

Created: 2025-07-14T19:33:31Z
Modified: 2025-07-15T00:34:20Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/07/GHSA-9548-qrrj-x5pj/GHSA-9548-qrrj-x5pj.json
CWE IDs: ["CWE-444"]
Alternative ID: GHSA-9548-qrrj-x5pj
Finding: F110
Auto approve: 1