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High severity7.5OSV Advisory· Published Jul 21, 2026· Updated Jul 30, 2026

CVE-2026-56819

CVE-2026-56819

Description

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, a remote unauthenticated peer can leak one direct ByteBuf per HTTP/2 DATA frame in applications that enable HTTP/2 content decompression via DelegatingDecompressorFrameListener. When a DATA frame is processed for a stream whose decompressor has already been closed, Http2Decompressor.decompress(...) calls decompressor.writeInbound(data.retain()) and does not release the retained buffer on the error path, eventually exhausting direct memory and crashing the JVM. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

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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-http2Maven
>= 4.2.0, < 4.2.16.Final4.2.16.Final
io.netty:netty-codec-http2Maven
>= 4.1.0.Final, < 4.1.136.Final4.1.136.Final

Affected products

70

Patches

Vulnerability mechanics

References

7

News mentions

1