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CVE-2024-27306 — aiohttp vulnerable to XSS on index pages for static file handling

2026-09-29T18:04:55.657660+00:00

Affected: aio-libs aiohttp, aiohttp

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. A XSS vulnerability exists on index pages for static file handling. This vulnerability is fixed in 3.9.4. We have always recommended using a reverse proxy server (e.g. nginx) for serving static files. Users following the recommendation are unaffected. Other users can disable `show_index` if unable to upgrade.

GHSA-7gpw-8wmc-pm8g — aiohttp Cross-site Scripting vulnerability on index pages for static file handling

2026-09-29T18:04:55.657790+00:00

Affected: PyPI: aiohttp

### Summary

A XSS vulnerability exists on index pages for static file handling.

### Details

When using `web.static(..., show_index=True)`, the resulting index pages do not escape file names.

If users can upload files with arbitrary filenames to the static directory, the server is vulnerable to XSS attacks.

### Workaround

We have always recommended using a reverse proxy server (e.g. nginx) for serving static files. Users following the recommendation are unaffected.

Other users can disable `show_index` if unable to upgrade.

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Patch: https://github.com/aio-libs/aiohttp/pull/8319/files

PYSEC-2026-1102 — aiohttp Cross-site Scripting vulnerability on index pages for static file handling

2026-09-29T18:04:55.657860+00:00