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CVE-2025-67735

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CVE-2025-67735

Published: Dec 16, 2025

Modified: Dec 16, 2025

PUBLISHED

CVSS v3.1

6.5

MEDIUM

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.

VendorProductVersions

netty

netty

affected
>= 4.2.0.Alpha1, < 4.2.8.Final
affected
< 4.1.129.Final

Weaknesses (CWE)

CWE-93

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

References

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