aiohttp Cross-site Scripting vulnerability on index pages for static file handling
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | aiohttp | < 3.9.4 | 3.9.4 |
References
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-7gpw-8wmc-pm8g
- https://nvd.nist.gov/vuln/detail/CVE-2024-27306
- https://github.com/aio-libs/aiohttp/pull/8319
- https://github.com/aio-libs/aiohttp/pull/8319/files
- https://github.com/aio-libs/aiohttp/commit/28335525d1eac015a7e7584137678cbb6ff19397
- https://github.com/aio-libs/aiohttp
- https://lists.debian.org/debian-lts-announce/2025/02/msg00002.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2EXRGTN2WG7VZLUZ7WOXU5GQJKCPPHKP
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NWEI6NIHZ3G7DURDZVMRK7ZEFC2BTD3U
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZIVBMPEY7WWOFMC3CWXFBRQPFECV4SW3
- https://pypi.org/project/aiohttp
- https://github.com/advisories/GHSA-7gpw-8wmc-pm8g
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- Python (PyPI)
- Package
aiohttp- Disclosed
- 18.04.2024
- Updated
- 11.10.2026 15:17
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-1102 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-7gpw-8wmc-pm8g - CC BY 4.0
Vulnerability history: aiohttp
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 55
- First → latest
- 02.2021 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 7
- Medium 29
- Low 19
Disclosures per year
- 2021: 1
- 2022: 0
- 2023: 6
- 2024: 7
- 2025: 1
- 2026: 40
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aiohttp Cross-site Scripting vulnerability on index pages for static file handling this entry
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