Vulnerabilities CVE-2026-42579

CVE-2026-42579

High

Open

TLP:CLEAR

Netty: DNS Codec Input Validation Bypass in Netty (Encoder + Decoder)

NVD CVE.org

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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.

Details

CVSS Score: 7.5
EPSS Score ⓘ: 0.97%

58.7th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Confidence: 90%
Published: May 13, 2026
Last Modified: Aug 13, 2026

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