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GHSA-9548-qrrj-x5pj

AIOHTTP is vulnerable to HTTP Request/Response Smuggling through incorrect parsing of chunked trailer sections

Source: GitHub Advisory Database (reviewed) Low CVE-2025-53643

Packages

EcosystemPackageAffectedFixed in
PyPI aiohttp < 3.12.14 3.12.14

Details

As written in the advisory (Markdown source, shown as plain text).

### 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

References

External links from the advisory. They lead to third-party sites.