CVE-2026-42579

HIGH SEVERITY

CVSS Score & Metrics

Base Score

7.5 / 10

Vector String

                                        CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N                                    

Vulnerability Description

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's DNS codec does not enforce RFC 1035 domain name constraints during either encoding or decoding. This creates a bidirectional attack surface: malicious DNS responses can exploit the decoder, and user-influenced hostnames can exploit the encoder. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

Vulnerability Details

Published Date

May 07, 2026

Last Modified

May 18, 2026

CWE ID

CWE-20

Source

GitHub

Vendor

maven

Product

io.netty:netty-codec-dns

External References

https://github.com/netty/netty/security/advisories/GHSA-cm33-6792-r9fm
https://tools.ietf.org/html/rfc1035#section-2.3.4
https://tools.ietf.org/html/rfc1035#section-4.1.4
https://github.com/advisories/GHSA-cm33-6792-r9fm

CVE-2026-42579

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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