Netty: WebSockets V07/V08 handshaker missing Connection/Upgrade validation

高 7.5CVE-2026-59898 · GHSA-4mp9-239f-g9hg · 29/07/2026 公開 · 06/08/2026 更新

要点

CVE-2026-59898 は io.netty:netty-codec-http, netty (netty) 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）：0.44%（全脆弱性の 38.2% より高い）。
対処：4.2.16.Final, 4.1.136.Final, 4.2.16, 4.1.136 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
io.netty:netty-codec-http Maven	`≥ 4.2.0.Final, < 4.2.16.Final< 4.1.136.Final`	`4.2.16.Final4.1.136.Final`
netty netty	`≥ 4.2.0, < 4.2.16< 4.1.136`	`4.2.164.1.136`

概要

Summary

An attacker can force WebSocket upgrade via the lax V07 (or V08) handshaker by sending Sec-WebSocket-Version: 7 and omitting Connection: Upgrade / Upgrade: websocket headers, completing a protocol switch that a proxy would not recognize as an Upgrade request and enabling HTTP request smuggling / protocol-confusion attacks.

NVD の説明

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, ab attacker can force WebSocket upgrade via the lax V07 (or V08) handshaker by sending `Sec-WebSocket-Version: 7` and omitting `Connection: Upgrade` / `Upgrade: websocket` headers, completing a protocol switch that a proxy would not recognize as an Upgrade request and enabling HTTP request smuggling / protocol-confusion attacks. This issue has been fixed in versions 4.1.136.Final and 4.2.16.Final.