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CVE-2025-69224 — AIOHTTP's Unicode processing of header values could cause parsing discrepancies

2026-10-05T20:09:32.798780+00:00

Affected: aio-libs aiohttp

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below of the Python HTTP parser may allow a request smuggling attack with the presence of non-ASCII characters. 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. This issue is fixed in version 3.13.3.

GHSA-69f9-5gxw-wvc2 — AIOHTTP's unicode processing of header values could cause parsing discrepancies

2026-10-05T20:09:32.798906+00:00

Affected: PyPI: aiohttp

### Summary The Python HTTP parser may allow a request smuggling attack with the presence of non-ASCII characters.

### 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.

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Patch: https://github.com/aio-libs/aiohttp/commit/32677f2adfd907420c078dda6b79225c6f4ebce0

PYSEC-2026-1099 — AIOHTTP's unicode processing of header values could cause parsing discrepancies

2026-10-05T20:09:32.798961+00:00

Affected: PyPI: aiohttp

### Summary The Python HTTP parser may allow a request smuggling attack with the presence of non-ASCII characters.

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Patch: https://github.com/aio-libs/aiohttp/commit/32677f2adfd907420c078dda6b79225c6f4ebce0