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 Details
- CVSS 4.0 Base Score: 2.9 (LOW)
- CVSS 4.0 Vector: (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)
- CVSS 3.1 Base Score: 7.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Atlassian Jira | — | Upgrade to the latest version of Atlassian JIRA | Oct 23, 2025 | Oct 21, 2025 |
| Debian | — | Upgrade netty | Mar 13, 2026 | Mar 13, 2026 |
| Red Hat Jboss Eap | — | Upgrade Red Hat JBoss EAP to the latest version | Sep 11, 2025 | Sep 3, 2025 |
| Suse | — | Upgrade netty-tcnative-javadocUpgrade netty-tcnativeUpgrade nettyUpgrade netty-javadoc | Dec 5, 2025 | Sep 9, 2025 |
| Ubuntu | — | Upgrade libnetty-javaUpgrade libnetty-java (Ubuntu Pro) | Dec 10, 2025 | Sep 3, 2025 |
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