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Low severityNVD Advisory· Published Sep 3, 2025· Updated Sep 5, 2025

Netty is vulnerable to request smuggling due to incorrect parsing of chunk extensions

CVE-2025-58056

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
io.netty:netty-codec-httpMaven
< 4.1.125.Final4.1.125.Final
io.netty:netty-codec-httpMaven
>= 4.2.0.Alpha1, < 4.2.5.Final4.2.5.Final

Affected products

558

Patches

Vulnerability mechanics

References

10

News mentions

0

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CVE-2025-58056 · low · VYPR