CVE WatchJul 15, 2026

CVE-2026-48043

Netty is a network application framework for development of protocol servers and clients. In netty-codec-http2 prior to versions 4.1.135.Fin

CVSS

5.3

Medium

EPSS

0.6%

p44

KEV

—

Exploit Today

0-100

Published: Jun 12, 2026 · Last modified: Jul 15, 2026 · CWE-400 · CWE-401 · CWE-772

EPSS · 30d

0.6%EPSS · 30 days0.6%

2026-06-302026-07-16

Technical description

Netty is a network application framework for development of protocol servers and clients. In netty-codec-http2 prior to versions 4.1.135.Final and 4.2.15.Final, the `DelegatingDecompressorFrameListener` class orchestrates HTTP/2 decompression by embedding a per-stream `EmbeddedChannel` that runs the appropriate decompression codec (gzip, deflate, zstd) and forwards decompressed chunks to a wrapped listener. Each decompressed chunk is a pooled `ByteBuf` handed to an anonymous `ChannelInboundHandlerAdapter` tail handler, which becomes the sole owner responsible for releasing it. A remote peer could send frames that would result in the flow-controller throwing and so trigger a resource leak which at the end might take down the whole JVM due OOME. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

Official references

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