CVE-2025-67735: Netty

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Netty Netty: before 4.1.129 (fixed in 4.1.129); from 4.2.0, before 4.2.8 (fixed in 4.2.8)

Published 2025-12-16. Last modified 2026-06-17.