CVE-2026-42579CRITICAL 7.5EPSS p58.4%

CVE-2026-42579CVE-2026-42579

netty / netty

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.

Scoring

CVSS 3.17.5 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS0.97% probability of exploitation · percentile 58.4% · 2026-08-03T12:00:16Z
Published2026-05-13
Last modified2026-07-15

Underlying weaknesses· 3

CWE-20CWE-400CWE-626

References

  1. https://github.com/netty/netty/security/advisories/GHSA-cm33-6792-r9fm
  2. https://github.com/netty/netty/security/advisories/GHSA-cm33-6792-r9fm

3

TypeTargetConfidenceTier
WeaknessImproper Input Validationcwe-200%live
WeaknessUncontrolled Resource Consumptioncwe-4000%live
WeaknessNull Byte Interaction Error (Poison Null Byte)cwe-6260%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.