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Fencer Intel
medium 6.5

CVE-2025-67735 json

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

published 10mo ago modified 26d ago also EUVD-2025-203450 , GHSA-84h7-rjj3-6jx4

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 25%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven io.netty:netty-codec-http 4.1.129.Final, 4.2.8.Final
  • io.netty netty-codec-http 4.1.129.Final, 4.2.8.Final
  • netty netty 4.1.129.Final, 4.2.8.Final
  • netty Debian 12 1:4.1.48-7+deb12u2
  • netty Debian 13 1:4.1.48-10+deb13u1
  • netty Debian 14 1:4.1.48-16

debian advisories DEBIAN-CVE-2025-67735

  • netty Ubuntu 22.04 LTS 1:4.1.48-4+deb11u2ubuntu0.2
  • netty Ubuntu 24.04 LTS 1:4.1.48-9ubuntu0.2
  • netty Ubuntu Pro 16.04 LTS 1:4.0.34-1ubuntu0.1~esm5
  • netty Ubuntu Pro 18.04 LTS 1:4.1.7-4ubuntu0.1+esm7
  • netty Ubuntu Pro 20.04 LTS 1:4.1.45-1ubuntu0.1~esm7
  • netty Ubuntu Pro 22.04 LTS 1:4.1.48-4+deb11u2ubuntu0.2+esm1
  • netty Ubuntu Pro 24.04 LTS 1:4.1.48-9ubuntu0.2+esm1

ubuntu advisories UBUNTU-CVE-2025-67735

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • netty SLE Module for Package Hub 15 SP7, openSUSE Leap 15.6 4.1.130-150200.4.40.1

suse advisories SUSE-SU-2025:4489-1

  • netty openSUSE Tumbleweed 4.1.130-1.1

opensuse advisories openSUSE-SU-2025:15824-1

Is CVE-2025-67735 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-67735 updated cvss 6.5

netty-codec-http: Netty (netty-codec-http): Request Smuggling via CRLF Injection

  • Red Hat Cryostat 4 netty-codec-http, netty-codec-http2 Red Hat Logging Subsystem for Red Hat OpenShift netty-codec-http, netty-codec-http2, openshift-logging/kibana6-rhel8, openshift-logging/elasticsearch6-rhel9, openshift-logging/logging-curator5-rhel9, openshift-logging/elasticsearch-proxy-rhel9, +2 more Red Hat OpenShift Serverless openshift-serverless-1/kn-ekb-receiver-rhel9, openshift-serverless-1/kn-ekb-dispatcher-rhel9, openshift-serverless-1/kn-eventing-integrations-log-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-s3-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-sns-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-sqs-sink-rhel9, +4 more Red Hat AMQ Broker 7 netty-codec-http, netty-codec-http2 Red Hat AMQ Clients netty-codec-http, netty-codec-http2 Red Hat build of Apache Camel - HawtIO 4 netty-codec-http, netty-codec-http2
    +7 more products
    Red Hat build of Apache Camel 4 for Quarkus 3 netty-codec-http, netty-codec-http2 Red Hat build of Apache Camel for Spring Boot 4 netty-codec-http, netty-codec-http2 Red Hat build of Apicurio Registry 2 netty-codec-http, netty-codec-http2 Red Hat build of Apicurio Registry 3 netty-codec-http, netty-codec-http2 Red Hat build of Debezium 2 netty-codec-http, netty-codec-http2 Red Hat build of Debezium 3 netty-codec-http, netty-codec-http2 Red Hat build of OptaPlanner 8 netty-codec-http, netty-codec-http2
    affected: workaround, no fix available “Fix deferred”
  • Red Hat build of Quarkus netty-codec-http2
    affected: workaround, no fix available
  • Red Hat Data Grid 8 netty-codec-http, netty-codec-http2 Red Hat Fuse 7 netty-codec-http, netty-codec-http2 Red Hat JBoss Enterprise Application Platform 7 netty-codec-http, netty-codec-http2 Red Hat JBoss Enterprise Application Platform 8 netty-codec-http, netty-codec-http2, org.postgresql-pgjdbc, org.jboss.eap-jboss-eap-xp Red Hat JBoss Enterprise Application Platform Expansion Pack netty-codec-http, netty-codec-http2, org.postgresql-pgjdbc, org.jboss.eap-jboss-eap-xp Red Hat OpenShift AI (RHOAI) rhoai/odh-modelmesh-rhel8, rhoai/odh-modelmesh-rhel9, rhoai/odh-trustyai-service-rhel8, rhoai/odh-trustyai-service-rhel9
    +6 more products
    Red Hat OpenShift Dev Spaces devspaces/server-rhel9, devspaces/openvsx-rhel9, devspaces/pluginregistry-rhel9 Red Hat Process Automation 7 netty-codec-http, netty-codec-http2 Red Hat Satellite 6 candlepin, candlepin-selinux Red Hat Single Sign-On 7 netty-codec-http, netty-codec-http2 Red Hat streams for Apache Kafka 2 netty-codec-http, netty-codec-http2 Red Hat streams for Apache Kafka 3 netty-codec-http, netty-codec-http2
    affected: workaround, no fix available “Fix deferred”
  • Red Hat build of Quarkus 3.20.5.redhat netty-codec-http 4.1.130.Final-redhat-00001
    fixed: vendor fix RHSA-2026:1899
  • Red Hat build of Quarkus 3.27.2.redhat netty-codec-http 4.1.130.Final-redhat-00001
    fixed: vendor fix RHSA-2026:1965
  • Red Hat build of Quarkus 3.20.5.redhat jna 5.8.0, lit 3.2.1, bson 5.3.1, db2 1.20.6, h2 2.3.230, y18n 5.0.8, +1015 more Red Hat build of Quarkus 3.27.2.redhat jna 5.8.0, bson 5.5.1, db2 1.21.4, h2 2.3.230, y18n 5.0.8, cliui 8.0.1, +1004 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
10mo ago

Exploit prediction

0.32% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/netty/netty/security/advisories/GHSA-84h7-rjj3-6jx4 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
GitHub 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
maven io.netty:netty-codec-http
>=4.2.0.Alpha1, <4.2.8.Final
<4.1.129.Final
4.2.8.Final
4.1.129.Final

Affected products

  • netty netty

Classification

Weakness
  • CWE-93 Improper Neutralization of CRLF Sequences

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.