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

3 known vulnerabilities (2 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: 1,841
- Releases: 29 since 4.2.0.Final (Apr 3, 2025)
- Registry: https://central.sonatype.com/artifact/io.netty/netty-codec-compression
- Releases read: Nov 8, 2026

## Version timeline

Affected versions per advisory, in version order:

- CVE-2026-59901: 4.2.0.Final to 4.2.15.Final (4.2.16.Final is outside it)
- CVE-2026-42583: 4.2.0.Alpha3 to 4.2.12.Final (4.2.13.Final is outside it)
- CVE-2025-58057: 4.2.0.Alpha3 to 4.2.4.Final (4.2.5.Final is outside it)

## Advisories (3)

### [CVE-2026-59901](https://cve.now/CVE-2026-59901): Netty Bzip2Decoder: Infinite Loop in RLE State Machine Leads to Event-Loop Thread Hang

- Severity: High 8.7
- Published: Jul 29, 2026
- Affected: from 4.2.0.Final, fixed in 4.2.16.Final.
- Fixed in 4.2.16.Final (released Jul 7, 2026, 22 days before disclosure).
- The latest release, 4.2.20.Final, is not affected.

### [CVE-2026-42583](https://cve.now/CVE-2026-42583): Netty: Lz4FrameDecoder resource exhaustion

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

### [CVE-2025-58057](https://cve.now/CVE-2025-58057): Netty's BrotliDecoder is vulnerable to DoS via zip bomb style attack

- Severity: Medium 6.9
- Published: Sep 3, 2025
- Affected: from 4.2.0.Alpha1, fixed in 4.2.5.Final.
- Fixed in 4.2.5.Final (released Sep 3, 2025, the day of disclosure).
- The latest release, 4.2.20.Final, is not affected.

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