CVE-2026-42582

7.5 HIGH

Netty is an asynchronous, event-driven network application framework

Published: 2026-05-13 · Last updated: 2026-05-18

Severity and scoring

CVSS: 7.5 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE: CWE-770, CWE-789

Affected products

Vendor	Product
netty	netty

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.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-42582
[Vendor advisory]https://github.com/netty/netty/security/advisories/GHSA-2c5c-chwr-9hqw
[Vendor advisory]https://github.com/netty/netty/security/advisories/GHSA-2c5c-chwr-9hqw

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