Netty has a CRLF Injection vulnerability in io.netty.handler.codec.http.HttpRequestEncoder_CVE-2025-67735

6.5 / 10

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Description

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.

Basic Information

ID CVE-2025-67735

Source GitHub_M

Published Dec 16, 2025 at 00:19

Affected Product

Vendor netty

Product netty

Version >= 4.2.0.Alpha1, < 4.2.8.Final

Affected Versions netty netty >= 4.2.0.Alpha1, < 4.2.8.Final
netty netty < 4.1.129.Final

CWE Classification

CWE-93

References

github.com /netty/netty/security/advisories/GHSA-84h7-rjj3-6jx4

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    "published": "2025-12-16T00:19:11.287Z",
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