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High severity7.5GHSA Advisory· Published May 13, 2026· Updated May 18, 2026

CVE-2026-42587

CVE-2026-42587

Description

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpContentDecompressor accepts a maxAllocation parameter to limit decompression buffer size and prevent decompression bomb attacks. This limit is correctly enforced for gzip and deflate encodings via ZlibDecoder, but is silently ignored when the content encoding is br (Brotli), zstd, or snappy. An attacker can bypass the configured decompression limit by sending a compressed payload with Content-Encoding: br instead of Content-Encoding: gzip, causing unbounded memory allocation and out-of-memory denial of service. The same vulnerability exists in DelegatingDecompressorFrameListener for HTTP/2 connections. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
io.netty:netty-codec-httpMaven
>= 4.2.0.Alpha1, < 4.2.13.Final4.2.13.Final
io.netty:netty-codec-http2Maven
>= 4.2.0.Alpha1, < 4.2.13.Final4.2.13.Final
io.netty:netty-codec-httpMaven
< 4.1.133.Final4.1.133.Final
io.netty:netty-codec-http2Maven
< 4.1.133.Final4.1.133.Final

Affected products

266

Patches

Vulnerability mechanics

References

3

News mentions

0

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