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

CVE-2026-42582

CVE-2026-42582

Description

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final, when decoding header blocks, the non-Huffman branch of io.netty.handler.codec.http3.QpackDecoder#decodeHuffmanEncodedLiteral may execute new byte[length] for a string literal before verifying that length bytes are actually present in the compressed field section. The wire encoding allows a very large length to be expressed in few bytes. There is no check that length <= in.readableBytes() before new byte[length]. This vulnerability is fixed in 4.2.13.Final.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
io.netty:netty-codec-http3Maven
< 4.2.13.Final4.2.13.Final

Affected products

49

Patches

Vulnerability mechanics

References

3

News mentions

0

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