# io.netty:netty-codec-http3 (Maven) vulnerabilities

4 known vulnerabilities (4 high), 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: 1,169
- Releases: 19 since 4.2.2.Final (Jun 5, 2025)
- Registry: https://central.sonatype.com/artifact/io.netty/netty-codec-http3
- Releases read: Nov 8, 2026

## Version timeline

Affected versions per advisory, in version order:

- CVE-2026-56816: 4.2.2.Final to 4.2.15.Final (4.2.16.Final is outside it)
- CVE-2026-48748: 4.2.2.Final to 4.2.14.Final (4.2.15.Final is outside it)
- CVE-2026-44892: 4.2.2.Final to 4.2.14.Final (4.2.15.Final is outside it)
- CVE-2026-42582: 4.2.2.Final to 4.2.12.Final (4.2.13.Final is outside it)

## Advisories (4)

### [CVE-2026-56816](https://cve.now/CVE-2026-56816): Netty: Memory Exhaustion via HTTP/3 Reserved Frame Types

- Severity: High 7.5
- Published: Jul 21, 2026
- Affected: fixed in 4.2.16.Final.
- Fixed in 4.2.16.Final (released Jul 7, 2026, 14 days before disclosure).
- The latest release, 4.2.20.Final, is not affected.

### [CVE-2026-48748](https://cve.now/CVE-2026-48748): Netty HTTP/3 QPACK Blocked Streams Memory Exhaustion

- Severity: High 7.5
- Published: Jun 12, 2026
- Affected: from 4.2.0.Final, fixed in 4.2.15.Final.
- Fixed in 4.2.15.Final (released Jun 2, 2026, 10 days before disclosure).
- The latest release, 4.2.20.Final, is not affected.

### [CVE-2026-44892](https://cve.now/CVE-2026-44892): Netty has a Vulnerable Default Configuration Which Leads to Denial of Service via Unbounded HTTP/3 Header Size

- Severity: High 7.5
- Published: Jun 12, 2026
- Affected: from 4.2.0.Final, fixed in 4.2.15.Final.
- Fixed in 4.2.15.Final (released Jun 2, 2026, 10 days before disclosure).
- The latest release, 4.2.20.Final, is not affected.

### [CVE-2026-42582](https://cve.now/CVE-2026-42582): Netty: HTTP/3 QPACK literal unbounded allocation

- Severity: High 7.5
- Published: May 13, 2026
- Affected: from 4.2.0.Final, 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.

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