AIOHTTP: Pure-Python parser request smuggling
### Summary The pure Python parser is vulnerable to an HTTP request smuggling attack. ### Impact If users are using the Python parser (`AIOHTTP_NO_EXTENSIONS`, or not a standard wheel installed), then an application may be vulnerable to a request smuggling attack. ### Workaround Switch to the default C parser.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-111750US | — | — | ||
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, the pure Python parser accepts ambiguous HTTP request framing. An unauthenticated a… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/aio-libs/aiohttpPACKAGE
- https://github.com/aio-libs/aiohttp/commit/9b27347e61454d9f8ca2055f4c67a37dee336e83WEB
- https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4WEB
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-pqxq-w44r-73xwWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-111750ADVISORY
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