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CVE-2026-54274 — AIOHTTP: Incomplete websocket frame payloads bypass memory limits

Affected: aio-libs aiohttp

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, if an attacker sends large incomplete websocket frame payloads, it may be possible to bypass the usual size limits on memory use. This vulnerability is fixed in 3.14.1.

GHSA-xcgm-r5h9-7989 — aiohttp: Incomplete websocket frame payloads bypass memory limits

Affected: PyPI: aiohttp

### Summary

If an attacker sends large incomplete websocket frame payloads, it may be possible to bypass the usual size limits on memory use.

### Impact

If a web application has WebSocket endpoints, it may be possible for an attacker to execute a DoS attack through excessive memory use.

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Patch: https://github.com/aio-libs/aiohttp/commit/14b6ee851fb16ec199acb950de0c82d476799e7d

PYSEC-2026-2108

Affected: PyPI: aiohttp