# io.netty:netty-codec-dns (Maven) vulnerabilities

2 known vulnerabilities (1 high, 1 medium), with the versions each affects and the releases that fix them.

## At a glance

- Latest release: 4.2.20.Final (Nov 2, 2026): no advisory affects it
- Newest unaffected release: 4.2.20.Final (Nov 2, 2026), the latest release
- Dependents: 1
- Releases: 188 since 4.1.0.Final (May 25, 2016)
- Registry: https://central.sonatype.com/artifact/io.netty/netty-codec-dns
- Releases read: Nov 8, 2026

## Version timeline

Affected versions per advisory, in version order:

- CVE-2026-73508: 4.1.0.Beta1 to 4.1.135.Final (4.1.136.Final is outside it); 4.2.0.Final to 4.2.15.Final (4.2.16.Final is outside it)
- CVE-2026-42579: 4.1.0.Beta1 to 4.1.132.Final (4.1.133.Final is outside it); 4.2.0.Alpha1 to 4.2.12.Final (4.2.13.Final is outside it)

## Advisories (2)

### [CVE-2026-73508](https://cve.now/CVE-2026-73508): Netty: Memory Leak in DNS Record Decoder via Malformed Domain Names

- Severity: Medium 5.3
- Published: Aug 13, 2026
- Affected: from 4.2.0.Final, fixed in 4.2.16.Final; fixed in 4.1.136.Final.
- Fixed in 4.1.136.Final (released Jul 8, 2026, 36 days before disclosure) and 4.2.16.Final (released Jul 7, 2026, 37 days before disclosure).
- The latest release, 4.2.20.Final, is not affected.

### [CVE-2026-42579](https://cve.now/CVE-2026-42579): Netty: DNS Codec Input Validation Bypass in Netty (Encoder + Decoder)

- Severity: High 7.5
- Published: May 13, 2026
- Affected: from 4.2.0.Alpha1, fixed in 4.2.13.Final; fixed in 4.1.133.Final.
- Fixed in 4.1.133.Final (released May 5, 2026, 8 days before disclosure) and 4.2.13.Final (released May 4, 2026, 9 days before disclosure).
- The latest release, 4.2.20.Final, is not affected.

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