aio-libs/aiohttp · Security
AIOHTTP is vulnerable to HTTP Request/Response Smuggling through incorrect parsing of chunked trailer sections
- GHSA ID
- GHSA-9548-qrrj-x5pj
- CVE ID
- CVE-2025-53643
- Severity
- low
- Published
- Updated
- CVSS v4
- 1.7 · 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
Description
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
CWEs
- CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')