aiohttp: TLS Server Hostname Override Is Ignored When Reusing HTTPS Connections

高 7.5CVE-2026-54275 · GHSA-4m7w-qmgq-4wj5 · PYSEC-2026-237 · 22/06/2026 公開 · 25/10/2026 更新

要点

CVE-2026-54275 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）：0.47%（全脆弱性の 40.7% 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

The server_hostname TLS SNI check can be bypassed when an existing connection is reused.

Impact

If an application makes multiple requests to the same domain, but with different per-request server_hostname parameters, then the later calls may succeed by reusing the existing connection when they should have been rejected due to the TLS SNI check.

Workaround

Disable keep_alive if you need to change the server_hostname check between requests.

Patch: https://github.com/aio-libs/aiohttp/commit/0ca2b6c28a25726527a8b60f25960262a91ed0e0

NVD の説明

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, the server_hostname TLS SNI check can be bypassed when an existing connection is reused. If an application makes multiple requests to the same domain, but with different per-request server_hostname parameters, then the later calls may succeed by reusing the existing connection when they should have been rejected due to the TLS SNI check. This vulnerability is fixed in 3.14.1.