CVE-2026-42579

Publication date 13 May 2026

Last updated 8 June 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

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.

Status

Package Ubuntu Release Status
netty 26.04 LTS resolute
Fixed 1:4.1.48-16ubuntu0.1~esm2
25.10 questing Ignored end of life, was needed
24.04 LTS noble
Fixed 1:4.1.48-9ubuntu0.1+esm3
22.04 LTS jammy
Fixed 1:4.1.48-4+deb11u2ubuntu0.1+esm3
20.04 LTS focal
Fixed 1:4.1.45-1ubuntu0.1~esm6
18.04 LTS bionic
Not affected
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected

Get expanded security coverage with Ubuntu Pro

Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. Free for personal use.

Get Ubuntu Pro 30-day free trial

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
netty

Severity score breakdown

CVSS version: CVSS v3.0

Base score 7.5 · High

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

References

Related Ubuntu Security Notices (USN)

Other references

Access our resources on patching vulnerabilities