CVE-2026-48059High· 7.5▾ TwilightNetty 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…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Jul 4.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.6%
0.6% → 0.6%
Last analysed / modified upstream
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.
netty < 4.1.135netty >= 4.2.0, < 4.2.15Upgrade past the affected range:
netty 4.2.15Affected packages:
io.netty:netty-codec-haproxy >= 4.2.0.Final, <= 4.2.14.Finalio.netty:netty-codec-haproxy <= 4.1.134.FinalPatched in:
io.netty:netty-codec-haproxy 4.2.15.Finalio.netty:netty-codec-haproxy 4.1.135.FinalSource: https://github.com/advisories/GHSA-h2qv-fj59-j46j
Connected by shared product, vendor, weakness, or advisory.
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