Netty HAProxy: Unbalanced Reference Count in Nested PP2_TYPE_SSL TLV Parsing Leads to Memory Exhaustion

高 7.5CVE-2026-48059 · GHSA-h2qv-fj59-j46j · 12/06/2026 公開 · 18/09/2026 更新

要点

CVE-2026-48059 は io.netty:netty-codec-haproxy, 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：4.2.15.Final, 4.1.135.Final, 4.2.15, 4.1.135 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-haproxy Maven	`≥ 4.2.0.Final, < 4.2.15.Final< 4.1.135.Final`	`4.2.15.Final4.1.135.Final`
netty netty	`≥ 4.2.0, < 4.2.15< 4.1.135`	`4.2.154.1.135`

概要

Impact

The HAProxy PROXY protocol v2 codec in netty leaks native or heap memory on every connection when a client sends a syntactically valid header containing nested PP2_TYPE_SSL TLVs (type-length-value records) at depth two or greater. The leak occurs on the successful parse path — no exception is thrown, the message fires downstream, the decoder removes itself, and the application releases the HAProxyMessage normally. Yet the underlying cumulation buffer (a pooled, potentially direct ByteBuf allocated by the channel) remains permanently pinned.

NVD の説明

Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, the HAProxy PROXY protocol v2 codec in netty leaks native or heap memory on every connection when a client sends a syntactically valid header containing nested `PP2_TYPE_SSL` TLVs (type-length-value records) at depth two or greater. The leak occurs on the successful parse path — no exception is thrown, the message fires downstream, the decoder removes itself, and the application releases the `HAProxyMessage` normally. Yet the underlying cumulation buffer (a pooled, potentially direct `ByteBuf` allocated by the channel) remains permanently pinned. Versions 4.1.135.Final and 4.2.15.Final patch the issue.