CVE-2025-58056Netty is an asynchronous event-driven network application framework for development of maintainable high performance protocol servers and clients.
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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.
- CVSS
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- Weakness (CWE)
- CWE-444
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 19, 2026
Affected products
netty netty netty:netty | before 4.1.125; from 4.2.0 before 4.2.5 | NVD |
References
- https://datatracker.ietf.org/doc/html/rfc9112#name-chunked-transfer-codingtechnical-description
- https://github.com/JLLeitschuh/unCVEed/issues/1issue-tracking, third-party-advisory
- https://github.com/netty/netty/commit/edb55fd8e0a3bcbd85881e423464f585183d1284patch
- https://github.com/netty/netty/issues/15522issue-tracking
- https://github.com/netty/netty/pull/15611issue-tracking, patch
- https://github.com/netty/netty/security/advisories/GHSA-fghv-69vj-qj49exploit, vendor-advisory
- https://w4ke.info/2025/06/18/funky-chunks.htmlbroken-link
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.