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GHSA-63hw-fmq6-xxg2

aiohttp: C HTTP Parser Bypasses max_line_size for Fragmented Lines

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-54277

Packages

EcosystemPackageAffectedFixed in
PyPI aiohttp < 3.14.1 3.14.1

Details

As written in the advisory (Markdown source, shown as plain text).

### Summary It is possible to bypass the max_line_size check in parts of an HTTP request in the C parser. ### Impact If using the optimised C parser (the default in pre-built wheels), then an attacker may be able to send oversized lines through the HTTP parser and use an excessive amount of memory, potentially leading to DoS. ----- Patch: https://github.com/aio-libs/aiohttp/commit/5ab61bb4cd88f19b712f12c7c9295fe262bf804d

References

External links from the advisory. They lead to third-party sites.