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CVE-2025-67735

Netty has a CRLF Injection vulnerability in io.netty.handler.codec.http.HttpRequestEncoder

Published: Dec 16, 2025Updated: Jan 2, 2026 Sources: CVE List NVD GHSA BDUCWE-93
NVD MITRE
6.5CVSSMEDIUM
EPSS Score
0.3%
Top 79.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-93

Affected Products

АЛЬТ СП 10АО «ИВК»
On-premOS
Operating Systems / linux-distro
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
Android StudioGoogle Inc
On-premDesktop App
Mobile Apps
nettyApache Software Foundation
On-premLibrary
OSS Libraries / generic-library
nettynetty
LibraryLibrary
OSS Libraries / generic-library
ао «ивк»commercialRUOperating Systemsaka ivk
ооо «ред софт»commercialRUOperating Systemsaka red soft
google inccommercialUSMobile Appsaka google
apache software foundationoss-projectUSWeb & CMS Pluginsaka apache foundation
nettyoss-projectOSS Librariesaka io.netty:netty, netty-incubator-codec-ohttp
and 1 more affected products View all →

Exploitability

Official Patch Available

References

https://github.com/netty/netty/security/advisories/GHSA-84h7-rjj3-6jx4
github.com
https://altsp.su/obnovleniya-bezopasnosti/
altsp.su
https://redos.red-soft.ru/support/secure/uyazvimosti/uyazvimost-netty-cve-2025-67735-7.3/?sphrase_id=1451684
redos.red-soft.ru
and 3 more references View all →

Timeline

Published
Dec 16, 2025
Last Updated
Jan 2, 2026

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