CVE-2026-34517
AIOHTTP: Late size enforcement for non-file multipart fields causes memory DoS
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
12th
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, for some multipart form fields, aiohttp read the entire field into memory before checking client_max_size. This issue has been patched in version 3.13.4.
| CWE | CWE-770 |
| Vendor | aio-libs |
| Product | aiohttp |
| Published | Apr 1, 2026 |
| Last Updated | Apr 2, 2026 |
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Affected Versions
aio-libs / aiohttp
< 3.13.4