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High severity7.5GHSA Advisory· Published Jun 12, 2026· Updated Jun 15, 2026

CVE-2026-48059

CVE-2026-48059

Description

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.

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LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
io.netty:netty-codec-haproxyMaven
>= 4.2.0.Final, < 4.2.15.Final4.2.15.Final
io.netty:netty-codec-haproxyMaven
< 4.1.135.Final4.1.135.Final

Affected products

57

Patches

Vulnerability mechanics

References

5

News mentions

1
CVE-2026-48059 · High · VYPR