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CVE-2025-69225 — AIOHTTP Regex Mismatch Allows Unicode in ASCII-Only Protocol Fields

2026-10-04T21:55:20.855462+00:00

Affected: aio-libs aiohttp

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below contain parser logic which allows non-ASCII decimals to be present in the Range header. There is no known impact, but there is the possibility that there's a method to exploit a request smuggling vulnerability. This issue is fixed in version 3.13.3.

GHSA-mqqc-3gqh-h2x8 — AIOHTTP has unicode match groups in regexes for ASCII protocol elements

2026-10-04T21:55:20.855532+00:00

Affected: PyPI: aiohttp

### Summary

The parser allows non-ASCII decimals to be present in the Range header.

### Impact

There is no known impact, but there is the possibility that there's a method to exploit a request smuggling vulnerability.

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Patch: https://github.com/aio-libs/aiohttp/commit/c7b7a044f88c71cefda95ec75cdcfaa4792b3b96

PYSEC-2026-1109 — AIOHTTP has unicode match groups in regexes for ASCII protocol elements