| Name | 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1113995 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| netty (PTS) | bullseye (security), bullseye | 1:4.1.48-4+deb11u2 | vulnerable |
| bookworm, bookworm (security) | 1:4.1.48-7+deb12u1 | vulnerable | |
| forky, sid, trixie | 1:4.1.48-10 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| netty | source | (unstable) | (unfixed) | 1113995 |
https://github.com/netty/netty/security/advisories/GHSA-fghv-69vj-qj49
https://github.com/netty/netty/issues/15522
https://github.com/netty/netty/pull/15611
https://github.com/netty/netty/commit/edb55fd8e0a3bcbd85881e423464f585183d1284 (netty-4.2.5.Final)