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CVE-2026-69243 — AIOHTTP: HTTP request smuggling via WebSocket upgrade

2026-09-29T03:07:45.353524+00:00

Affected: aio-libs aiohttp

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the HTTP parsers were vulnerable to a request smuggling attack relating to WebSocket upgrades. If using the server-side component, an attacker may be able to execute a request smuggling vulnerability using an edge case in the WebSocket upgrade procedure. A WebSocket upgrade request with a body could cause the parser to switch protocols before the complete request body was received, leaving trailing bytes to be handled as upgraded-protocol or pipelined data rather than normal HTTP body data. This issue is fixed in version 3.14.2.

GHSA-mfx4-hv73-q22v — AIOHTTP: HTTP request smuggling via WebSocket upgrade

2026-09-29T03:07:45.353895+00:00

Affected: PyPI: aiohttp

### Summary

The HTTP parsers were vulnerable to a request smuggling attack relating to WebSocket upgrades.

### Impact

If using the server-side component, it may be possible for an attacker to execute a request smuggling vulnerability using an edge case in the WebSocket upgrade procedure. AIOHTT is unaware of any public exploit code.

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Patch: https://github.com/aio-libs/aiohttp/commit/6ae358f0983c3f4d6f67692b2f8e65dc8e091c98

PYSEC-2026-3546 — AIOHTTP: HTTP request smuggling via WebSocket upgrade

2026-09-29T03:07:45.354023+00:00

Affected: PyPI: aiohttp

### Summary

The HTTP parsers were vulnerable to a request smuggling attack relating to WebSocket upgrades.

### Impact

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Patch: https://github.com/aio-libs/aiohttp/commit/6ae358f0983c3f4d6f67692b2f8e65dc8e091c98