# CVE-2025-58056: netty: Netty is an asynchronous event-driven network application framework for development of maintainable high performance...

CVE-2025-58056 is fixed in 3 products on 1 platform, first by DEBIAN-CVE-2025-58056, released September 3, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-58056
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0071
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 3, 2025

## Description

Netty is an asynchronous event-driven network application framework for development of maintainable high performance protocol servers and clients. In versions 4.1.124.Final, and 4.2.0.Alpha3 through 4.2.4.Final, Netty incorrectly accepts standalone newline characters (LF) as a chunk-size line terminator, regardless of a preceding carriage return (CR), instead of requiring CRLF per HTTP/1.1 standards. When combined with reverse proxies that parse LF differently (treating it as part of the chunk extension), attackers can craft requests that the proxy sees as one request but Netty processes as two, enabling request smuggling attacks. This is fixed in versions 4.1.125.Final and 4.2.5.Final.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libnetty-java Ubuntu 18.04.6 LTS (bionic) | 1:4.1.7-4ubuntu0.1+esm5 | [libnetty-java 1:4.1.7-4ubuntu0.1+esm5](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libnetty-java-1-4.1.7-4ubuntu0.1-esm5.md) | Sep 4, 2025 |
| Linux | libnetty-java Ubuntu 20.04 LTS (focal) | 1:4.1.45-1ubuntu0.1~esm4 | [libnetty-java 1:4.1.45-1ubuntu0.1~esm4](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libnetty-java-1-4.1.45-1ubuntu0.1-esm4.md) | Sep 4, 2025 |
| Linux | libnetty-java Ubuntu 22.04.1 LTS (jammy) | 1:4.1.48-4+deb11u2ubuntu0.1 | [libnetty-java 1:4.1.48-4+deb11u2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libnetty-java-1-4.1.48-4-deb11u2ubuntu0.1.md) | Sep 4, 2025 |
| Linux | libnetty-java Ubuntu 24.04.5 LTS (noble) | 1:4.1.48-9ubuntu0.1 | [libnetty-java 1:4.1.48-9ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libnetty-java-1-4.1.48-9ubuntu0.1.md) | Sep 4, 2025 |
| Linux | libnetty-java Ubuntu 25.10 (questing) | 1:4.1.48-10ubuntu0.25.10.2 | [libnetty-java 1:4.1.48-10ubuntu0.25.10.2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libnetty-java-1-4.1.48-10ubuntu0.25.10.2.md) | Sep 4, 2025 |
| Linux | netty Debian 12.15 (bookworm) | 1:4.1.48-7+deb12u2 | [DEBIAN-CVE-2025-58056](https://patchblox.com/security/data/fix/linux/debian-cve-2025-58056.md) | Sep 3, 2025 |
| Linux | netty Debian 13.5 (trixie) | 1:4.1.48-10+deb13u1 | [DEBIAN-CVE-2025-58056](https://patchblox.com/security/data/fix/linux/debian-cve-2025-58056.md) | Sep 3, 2025 |
| Linux | netty Debian 14 | 1:4.1.48-13 | [DEBIAN-CVE-2025-58056](https://patchblox.com/security/data/fix/linux/debian-cve-2025-58056.md) | Sep 3, 2025 |
| Linux | netty opensuse-leap 15.6 | 4.1.126-150200.4.34.1 | [SUSE-SU-2025:03114-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03114-1.md) | Sep 9, 2025 |
| Linux | netty sles 15.6 | 4.1.126-150200.4.34.1 | [SUSE-SU-2025:03114-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03114-1.md) | Sep 9, 2025 |
| Linux | netty sles 15.7 | 4.1.126-150200.4.34.1 | [SUSE-SU-2025:03114-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03114-1.md) | Sep 9, 2025 |
| Linux | netty-tcnative opensuse-leap 15.6 | 2.0.73-150200.3.30.1 | [SUSE-SU-2025:03114-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03114-1.md) | Sep 9, 2025 |
| Linux | netty-tcnative sles 15.6 | 2.0.73-150200.3.30.1 | [SUSE-SU-2025:03114-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03114-1.md) | Sep 9, 2025 |
| Linux | netty-tcnative sles 15.7 | 2.0.73-150200.3.30.1 | [SUSE-SU-2025:03114-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03114-1.md) | Sep 9, 2025 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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