AIOHTTP's unicode processing of header values could cause parsing discrepancies
GHSA-69f9-5gxw-wvc2 · CVE-2025-69224 · PYSEC-2026-1099
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Description
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.
Patch: https://github.com/aio-libs/aiohttp/commit/32677f2adfd907420c078dda6b79225c6f4ebce0
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