aiohttp: C HTTP Parser Bypasses max_line_size for Fragmented Lines

高 7.5CVE-2026-54277 · GHSA-63hw-fmq6-xxg2 · PYSEC-2026-2110 · 22/06/2026 公開 · 25/10/2026 更新

要点

CVE-2026-54277 は aiohttp, aiohttp (aiohttp) に影響する深刻度「高」 (CVSS 7.5) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.56%（全脆弱性の 46.8% より高い）。
対処：3.14.1 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
aiohttp PyPI	`< 3.14.1`	`3.14.1`
aiohttp aiohttp	`< 3.14.1`	`3.14.1`

概要

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

NVD の説明

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, it is possible to bypass the max_line_size check in parts of an HTTP request in the C parser. 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. This vulnerability is fixed in 3.14.1.