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

5 known vulnerabilities (3 high, 2 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: 0
- Releases: 216 since 4.0.29.Final (Jun 23, 2015)
- Registry: https://central.sonatype.com/artifact/io.netty/netty-codec-haproxy
- Releases read: Nov 8, 2026

## Version timeline

Affected versions per advisory, in version order:

- CVE-2026-59919: 4.0.29.Final 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-2026-55851: 4.1.0.Final 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-2026-48059: 4.0.29.Final to 4.1.134.Final (4.1.135.Final is outside it); 4.2.0.Final to 4.2.14.Final (4.2.15.Final is outside it)
- CVE-2026-44893: 4.0.29.Final to 4.1.134.Final (4.1.135.Final is outside it); 4.2.0.Final to 4.2.14.Final (4.2.15.Final is outside it)
- CVE-2022-41881: 4.0.29.Final to 4.1.85.Final (4.1.86.Final is outside it)

## Advisories (5)

### [CVE-2026-59919](https://cve.now/CVE-2026-59919): Netty: HAProxy V1 Protocol CRLF Injection via AF\_UNIX Address

- Severity: Medium 5.5
- Published: Jul 29, 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, 21 days before disclosure) and 4.2.16.Final (released Jul 7, 2026, 22 days before disclosure).
- The latest release, 4.2.20.Final, is not affected.

### [CVE-2026-55851](https://cve.now/CVE-2026-55851): Netty codec-haproxy: Signed-Byte Sentinel Collision in HAProxyMessageDecoder Leads to Unbounded Memory Exhaustion

- Severity: High 8.7
- Published: Jul 21, 2026
- Affected: from 4.2.0.Final, fixed in 4.2.16.Final; from 4.1.0.Final, fixed in 4.1.136.Final.
- Fixed in 4.1.136.Final (released Jul 8, 2026, 13 days before disclosure) and 4.2.16.Final (released Jul 7, 2026, 14 days before disclosure).
- The latest release, 4.2.20.Final, is not affected.

### [CVE-2026-48059](https://cve.now/CVE-2026-48059): Netty HAProxy: Unbalanced Reference Count in Nested PP2\_TYPE\_SSL TLV Parsing Leads to Memory Exhaustion

- Severity: High 8.7
- Published: Jun 12, 2026
- Affected: from 4.2.0.Final, fixed in 4.2.15.Final; fixed in 4.1.135.Final.
- Fixed in 4.1.135.Final (released Jun 2, 2026, 10 days before disclosure) and 4.2.15.Final (released Jun 2, 2026, 10 days before disclosure).
- The latest release, 4.2.20.Final, is not affected.

### [CVE-2026-44893](https://cve.now/CVE-2026-44893): Netty: HAProxy SSL TLV parsing leaks retained slice on invalid TLV length

- Severity: High 7.5
- Published: Jun 12, 2026
- Affected: from 4.2.0.Final, fixed in 4.2.15.Final; fixed in 4.1.135.Final.
- Fixed in 4.1.135.Final (released Jun 2, 2026, 10 days before disclosure) and 4.2.15.Final (released Jun 2, 2026, 10 days before disclosure).
- The latest release, 4.2.20.Final, is not affected.

### [CVE-2022-41881](https://cve.now/CVE-2022-41881): Netty project is an event-driven asynchronous network application framework.

- Severity: Medium 5.3
- Published: Dec 12, 2022
- Affected: fixed in 4.1.86.Final.
- Fixed in 4.1.86.Final (released Dec 12, 2022, the day of disclosure).
- The latest release, 4.2.20.Final, is not affected.

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