Netty: [SpdyHttpDecoder] ByteBuf Reference Leak on RST_STREAM Leads to Native Memory Exhaustion

高 7.5CVE-2026-56745 · GHSA-jppx-w49h-x2qq · 21/07/2026 公開 · 30/07/2026 更新

要点

CVE-2026-56745 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）：0.63%（全脆弱性の 50.2% より高い）。
対処：4.1.136.Final, 4.2.16.Final, 4.1.136, 4.2.16 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	`≥ 4.1.0.Final, < 4.1.136.Final≥ 4.2.0.Final, < 4.2.16.Final`	`4.1.136.Final4.2.16.Final`
netty netty	`≥ 4.1.0, < 4.1.136≥ 4.2.0, < 4.2.16`	`4.1.1364.2.16`

概要

The SpdyHttpDecoder handler in Netty's SPDY-to-HTTP codec allocates a pooled ByteBuf when processing a client-initiated SYN_STREAM frame with FLAG_FIN=0, storing the partially-constructed FullHttpRequest in an internal map (messageMap) to accumulate subsequent DATA frames. When the remote peer sends an RST_STREAM for that stream, or when the accumulated content exceeds maxContentLength, the decoder removes the entry from the map but never releases the pooled ByteBuf, permanently leaking the allocated memory.

NVD の説明

Netty is a network application framework for development of protocol servers and clients. In versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, the `SpdyHttpDecoder` handler in Netty's SPDY-to-HTTP codec allocates a pooled `ByteBuf` when processing a client-initiated `SYN_STREAM` frame with `FLAG_FIN=0` and stores the partially constructed `FullHttpRequest` in `messageMap`; when the remote peer sends `RST_STREAM` for that stream or the accumulated content exceeds `maxContentLength`, the decoder removes the entry but does not release the pooled `ByteBuf`, causing native memory exhaustion. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.