CVE-2026-42579

CriticalCVSS 9.1/10Last modified Sep 18, 2026

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.

Metrics

CVSS 3.1 9.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Weakness enumeration

CWE-20 CWE-400 CWE-626 CWE-1286

Affected software

No affected versions have been published.

Timeline

Published: May 13, 2026
Last modified: Sep 18, 2026
NVD status: Modified

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