Netty: [Bzip2Decoder] Infinite Loop in RLE State Machine Leads to Event-Loop Thread Hang

高 7.5CVE-2026-59901 · GHSA-558v-64gr-wgg4 · 29/07/2026 公開 · 06/08/2026 更新

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 Maven	`< 4.1.136.Final`	`4.1.136.Final`
io.netty:netty-codec-compression Maven	`≥ 4.2.0.Final, < 4.2.16.Final`	`4.2.16.Final`
netty netty	`≥ 4.2.0, < 4.2.16< 4.1.136`	`4.2.164.1.136`

概要

The Bzip2Decoder handler in Netty's compression codec pipeline is vulnerable to a denial-of-service attack through a malformed bzip2 stream that permanently captures the event-loop thread in an infinite loop. The vulnerability exists in the run-length encoding (RLE) state machine within [Bzip2BlockDecompressor.read()]

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, the `Bzip2Decoder` handler in Netty's compression codec pipeline is vulnerable to a denial-of-service attack through a malformed bzip2 stream that permanently captures the event-loop thread in an infinite loop. The vulnerability exists in the run-length encoding (RLE) state machine within [`Bzip2BlockDecompressor.read()`]. This issue has been fixed in versions 4.1.136.Final and 4.2.16.Final.