CVE-2025-67735 — CRLF Injection in Netty

CWE-93 — CRLF Injection8 documents7 sources
Severity
6.5MEDIUMNVD
EPSS
0.0%
top 91.29%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
NettyDebian Netty
Timeline
PublishedDec 16
Latest updateJan 15

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 4.1.1…

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:NExploitability: 3.9 | Impact: 2.5

Affected Packages4 packages

▶CVEListV5netty/netty< 4.1.129.Final+1
▶NVDnetty/netty4.2.0 — 4.2.8+1
▶debiandebian/netty< netty 1:4.1.48-7+deb12u2 (bookworm)
▶Debiannetty/netty< 1:4.1.48-4+deb11u3+3

🔴Vulnerability Details

3
OSV
CVE-2025-67735: Netty is an asynchronous, event-driven network application framework↗2025-12-16
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GHSA
Netty has a CRLF Injection vulnerability in io.netty.handler.codec.http.HttpRequestEncoder↗2025-12-15
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OSV
Netty has a CRLF Injection vulnerability in io.netty.handler.codec.http.HttpRequestEncoder↗2025-12-15
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📋Vendor Advisories

3
Oracle
Oracle Oracle Database Server Risk Matrix: Oracle Graal Development Kit for Micronaut (Nimbus JOSE+JWT) — CVE-2025-67735↗2026-01-15
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Red Hat
netty-codec-http: Netty (netty-codec-http): Request Smuggling via CRLF Injection↗2025-12-16
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Debian
CVE-2025-67735: netty - Netty is an asynchronous, event-driven network application framework. In version...↗2025
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🕵️Threat Intelligence

1
Wiz
CVE-2025-67735 Impact, Exploitability, and Mitigation Steps | Wiz↗
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