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.
Affected products
netty: netty
References7
- github.com/netty/netty/security/advisories/GHSA-fghv-69vj-qj49 ExploitVendor Advisory
- github.com/netty/netty/commit/edb55fd8e0a3bcbd85881e423464f5851… Patch
- github.com/netty/netty/pull/15611 Issue TrackingPatch
- datatracker.ietf.org/doc/html/rfc9112#name-chunked-transfer-cod… Technical Description
- github.com/JLLeitschuh/unCVEed/issues/1 Issue TrackingThird Party Advisory
- github.com/netty/netty/issues/15522 Issue Tracking
- w4ke.info/2025/06/18/funky-chunks.html Broken Link
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - CVSS 4.0
-
2.9
LOW
Score source: CNA
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 1% percentile: 54 · as of 8 November 2026
- CWE
- CWE-444
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