Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.129.Final and 4.2.8.Final, the `io.netty.handler.codec.http.HttpRequestEncoder` has a CRLF injection with the request URI when constructing a request. This leads to request smuggling when `HttpRequestEncoder` is used without proper sanitization of the URI. Any application / framework using `HttpRequestEncoder` can be subject to be abused to perform request smuggling using CRLF injection. Versions 4.1.129.Final and 4.2.8.Final fix the issue.
CVSS Details
- CVSS 3.1 Base Score: 6.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade netty | Mar 13, 2026 | Mar 13, 2026 |
| Oracle Missing Cpu Jan 2026 | — | Apply the January 2026 Critical Patch Update (CPU) for Oracle Database | Jan 21, 2026 | Dec 16, 2025 |
| Ubuntu | — | Upgrade libnetty-java (Ubuntu Pro)Upgrade libnetty-java | Aug 23, 2026 | Aug 20, 2026 |
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