Skip to content
Fencer Vulns
high 7.3

CVE-2026-42584 json

Netty: HttpClientCodec response desynchronization

published 2026-05-07 6 mo ago modified 2026-10-26 13 d ago also EUVD-2026-30127 , GHSA-57rv-r2g8-2cj3

cvss
7.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 58%
public exploits
0
none known

Summary

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpClientCodec pairs each inbound response with an outbound request by queue.poll() once per response, including for 1xx. If the client pipelines GET then HEAD and the server sends 103, then 200 with GET body, then 200 for HEAD, the queue pairs HEAD with the first 200. The HEAD rule then skips reading that message’s body, so the GET entity bytes stay on the stream and the following 200 is parsed from the wrong offset. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

Patch / fix

  • maven io.netty:netty-codec-http 4.1.133.Final, 4.2.13.Final
  • Red Hat Cryostat 4 on RHEL 9 4.2.0-10
  • Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 0:1.5.26-2.Final_redhat_00001.1.el7eap, 0:1.10.0-46.Final_redhat_00044.1.el7eap, 0:2.2.40-2.SP3_redhat_00001.1.el7eap, 0:2.3.14-11.SP11_redhat_00001.1.el7eap, 0:2.5.5-24.SP12_redhat_00016.1.el7eap, 0:2.5.5-30.SP12_redhat_00020.1.el7eap, 0:2.16.0-22.redhat_00057.1.el7eap, 0:2.18.8-1.redhat_00003.1.el7eap, 0:4.1.135-1.Final_redhat_00001.1.el7eap, 0:5.0.31-3.SP2_redhat_00001.1.el7eap, 0:7.4.25-2.GA_redhat_00001.1.el7eap
  • Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8 0:1.5.26-2.Final_redhat_00001.1.el8eap, 0:1.10.0-46.Final_redhat_00044.1.el8eap, 0:2.2.40-1.SP3_redhat_00001.1.el8eap, 0:2.3.14-11.SP11_redhat_00001.1.el8eap, 0:2.5.5-24.SP12_redhat_00016.1.el8eap, 0:2.5.5-30.SP12_redhat_00020.1.el8eap, 0:2.16.0-22.redhat_00057.1.el8eap, 0:2.18.8-1.redhat_00003.1.el8eap, 0:4.1.135-1.Final_redhat_00001.1.el8eap, 0:5.0.31-3.SP2_redhat_00001.1.el8eap, 0:7.4.25-2.GA_redhat_00001.1.el8eap
  • Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9 0:1.5.26-2.Final_redhat_00001.1.el9eap, 0:1.10.0-46.Final_redhat_00044.1.el9eap, 0:2.2.40-1.SP3_redhat_00001.1.el9eap, 0:2.3.14-11.SP11_redhat_00001.1.el9eap, 0:2.5.5-24.SP12_redhat_00016.1.el9eap, 0:2.5.5-30.SP12_redhat_00020.1.el9eap, 0:2.16.0-22.redhat_00057.1.el9eap, 0:2.18.8-1.redhat_00003.1.el9eap, 0:4.1.135-1.Final_redhat_00001.1.el9eap, 0:5.0.31-3.SP2_redhat_00001.1.el9eap, 0:7.4.25-2.GA_redhat_00001.1.el9eap
  • Red Hat Red Hat JBoss Enterprise Application Platform 8.1.7.GA 4.1.135.Final-redhat-00001
  • Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 0:4.1.135-1.Final_redhat_00001.1.el10eap, 0:8.1.7.1-1.GA_redhat_00004.1.el10eap, 0:801.7.1-1.GA_redhat_00001.1.el10eap
  • Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 0:0.9.6-2.redhat_00002.1.el8eap, 0:4.1.135-1.Final_redhat_00001.1.el8eap, 0:8.1.7.1-1.GA_redhat_00004.1.el8eap, 0:801.7.1-1.GA_redhat_00001.1.el8eap
  • Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 0:0.9.6-2.redhat_00002.1.el9eap, 0:4.1.135-1.Final_redhat_00001.1.el9eap, 0:8.1.7.1-1.GA_redhat_00004.1.el9eap, 0:801.7.1-1.GA_redhat_00001.1.el9eap
  • Red Hat Red Hat OpenShift AI 2.25 1783443816, 1788198681
  • Red Hat Red Hat OpenShift Dev Spaces 3.28 1780694994, 1780696380, 1780948325
  • Red Hat Red Hat OpenShift Dev Spaces 3.29 1782989027
  • netty Ubuntu Pro 14.04 LTS 1:3.2.6.Final-2+deb8u2ubuntu0.1~esm1
  • netty Ubuntu Pro 16.04 LTS 1:4.0.34-1ubuntu0.1~esm4
  • netty Ubuntu Pro 18.04 LTS 1:4.1.7-4ubuntu0.1+esm6
  • netty Ubuntu Pro 20.04 LTS 1:4.1.45-1ubuntu0.1~esm6
  • netty Ubuntu Pro 22.04 LTS 1:4.1.48-4+deb11u2ubuntu0.1+esm3
  • netty Ubuntu Pro 24.04 LTS 1:4.1.48-9ubuntu0.1+esm3
  • netty Ubuntu Pro 26.04 LTS 1:4.1.48-16ubuntu0.1~esm2

ubuntu advisories UBUNTU-CVE-2026-42584

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

  • eap8-netty jboss enterprise application platform 8.1 4.1.135-1.Final_redhat_00001.1.el10eap
  • eap8-netty jboss enterprise application platform 8.1 4.1.135-1.Final_redhat_00001.1.el8eap
  • eap8-netty jboss enterprise application platform 8.1 4.1.135-1.Final_redhat_00001.1.el9eap
  • eap8-jose4j jboss enterprise application platform 8.1 0.9.6-2.redhat_00002.1.el8eap
  • eap8-jose4j jboss enterprise application platform 8.1 0.9.6-2.redhat_00002.1.el9eap
  • eap8-wildfly jboss enterprise application platform 8.1 8.1.7.1-1.GA_redhat_00004.1.el10eap
  • eap8-wildfly jboss enterprise application platform 8.1 8.1.7.1-1.GA_redhat_00004.1.el8eap
  • eap8-wildfly jboss enterprise application platform 8.1 8.1.7.1-1.GA_redhat_00004.1.el9eap

red hat advisories RHSA-2026:73976RHSA-2026:73644RHSA-2026:53645RHSA-2026:53646RHSA-2026:53644RHSA-2026:49700

  • netty-tcnative SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 2.0.77-150200.3.39.1
  • netty SLE Module for Package Hub 15 SP7 4.1.133-150200.4.46.1

suse advisories SUSE-SU-2026:2308-1

  • netty openSUSE Tumbleweed 4.1.133-1.1

opensuse advisories openSUSE-SU-2026:10795-1

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-2026-42584 updated cvss 7.3

netty: io.netty/netty-codec-http: Netty: Incorrect HTTP response parsing leads to data confusion

  • 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
    affected: no fix available
  • Red Hat build of Apicurio Registry 2 netty-codec-http
    affected: no fix planned “Will not fix”
  • Red Hat build of Apicurio Registry 3 netty-codec-http
    affected: no fix available
  • Red Hat build of Debezium 3 netty-codec-http Red Hat Build of Keycloak rhbk/keycloak-rhel9, rhbk/keycloak-rhel9-operator
    affected: no fix planned “Will not fix”
  • Red Hat build of OptaPlanner 8 netty-codec-http
    affected: no fix available
  • Red Hat Data Grid 8 netty-codec-http Red Hat Enterprise Linux AI (RHEL AI) 3 bazel6, bazel7, bazel8 Red Hat Fuse 7 netty-codec-http Red Hat JBoss Enterprise Application Platform Expansion Pack netty-codec-http Red Hat Process Automation 7 netty-codec-http Red Hat Single Sign-On 7 netty-codec-http
    affected: no fix planned “Will not fix”
  • Red Hat AMQ Clients 2026.Q3
    fixed: vendor fix RHSA-2026:69459
  • Red Hat Cryostat 4 on RHEL 9 cryostat/cryostat-rhel9 4.2.0-10, cryostat/jfr-datasource-rhel9 4.2.0-10, cryostat/cryostat-reports-rhel9 4.2.0-10
    fixed: vendor fix RHSA-2026:28010
show 20 more
  • Red Hat AMQ Broker 7.13.6
    fixed: vendor fix RHSA-2026:66545
  • Red Hat AMQ Broker 7.14.1
    fixed: vendor fix RHSA-2026:66488
  • Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16
    fixed: vendor fix RHSA-2026:37390
  • Red Hat build of Keycloak 26.4.13
    fixed: vendor fix RHSA-2026:30049
  • Red Hat build of Quarkus 3.27.4.redhat netty-codec-http 4.1.133.Final-redhat-00002
    fixed: vendor fix RHSA-2026:23808
  • Red Hat build of Quarkus 3.33.2.redhat netty-codec-http 4.1.133.Final-redhat-00002
    fixed: vendor fix RHSA-2026:24502
  • Red Hat JBoss EAP 7.4 ELS for RHEL 7 Server eap7-wildfly 7.4.25-2.GA_redhat_00001.1.el7eap, eap7-jackson-core 2.18.8-1.redhat_00003.1.el7eap, eap7-netty 4.1.135-1.Final_redhat_00001.1.el7eap, eap7-undertow 2.2.40-2.SP3_redhat_00001.1.el7eap, eap7-jackson-databind 2.18.8-1.redhat_00003.1.el7eap, eap7-netty-all 4.1.135-1.Final_redhat_00001.1.el7eap, +78 more
    fixed: vendor fix RHSA-2026:53644
  • Red Hat JBoss EAP 8.1 for RHEL 8 eap8-jose4j 0.9.6-2.redhat_00002.1.el8eap, eap8-wildfly 8.1.7.1-1.GA_redhat_00004.1.el8eap, eap8-netty 4.1.135-1.Final_redhat_00001.1.el8eap, eap8-netty-codec 4.1.135-1.Final_redhat_00001.1.el8eap, eap8-netty-buffer 4.1.135-1.Final_redhat_00001.1.el8eap, eap8-netty-common 4.1.135-1.Final_redhat_00001.1.el8eap, +16 more Red Hat JBoss EAP 8.1 for RHEL 9 eap8-jose4j 0.9.6-2.redhat_00002.1.el9eap, eap8-wildfly 8.1.7.1-1.GA_redhat_00004.1.el9eap, eap8-netty 4.1.135-1.Final_redhat_00001.1.el9eap, eap8-netty-codec 4.1.135-1.Final_redhat_00001.1.el9eap, eap8-netty-buffer 4.1.135-1.Final_redhat_00001.1.el9eap, eap8-netty-common 4.1.135-1.Final_redhat_00001.1.el9eap, +16 more Red Hat JBoss EAP 8.1 for RHEL 10 eap8-wildfly 8.1.7.1-1.GA_redhat_00004.1.el10eap, eap8-netty 4.1.135-1.Final_redhat_00001.1.el10eap, eap8-netty-codec 4.1.135-1.Final_redhat_00001.1.el10eap, eap8-netty-buffer 4.1.135-1.Final_redhat_00001.1.el10eap, eap8-netty-common 4.1.135-1.Final_redhat_00001.1.el10eap, eap8-wildfly-modules 8.1.7.1-1.GA_redhat_00004.1.el10eap, +14 more
    fixed: vendor fix RHSA-2026:49700
  • Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 Server eap7-wildfly 7.1.16-1.GA_redhat_00002.1.ep7.el7, eap7-netty 4.1.63-4.Final_redhat_00005.1.ep7.el7, eap7-hibernate 5.1.17-5.Final_redhat_00006.1.ep7.el7, eap7-netty-all 4.1.63-4.Final_redhat_00005.1.ep7.el7, eap7-wildfly-modules 7.1.16-1.GA_redhat_00002.1.ep7.el7, eap7-hibernate-core 5.1.17-5.Final_redhat_00006.1.ep7.el7, +4 more
    fixed: vendor fix RHSA-2026:73976
  • Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 Server eap7-wildfly 7.3.19-1.GA_redhat_00004.1.el7eap, eap7-netty 4.1.63-7.Final_redhat_00005.1.el7eap, eap7-hibernate 5.3.39-1.Final_redhat_00001.1.el7eap, eap7-netty-all 4.1.63-7.Final_redhat_00005.1.el7eap, eap7-wildfly-modules 7.3.19-1.GA_redhat_00004.1.el7eap, eap7-wildfly-javadocs 7.3.19-1.GA_redhat_00004.1.el7eap, +28 more
    fixed: vendor fix RHSA-2026:73644
  • Red Hat JBoss Enterprise Application Platform 7.4.25
    fixed: vendor fix RHSA-2026:53806
  • Red Hat JBoss Enterprise Application Platform 8.1.7.GA netty-codec-http 4.1.135.Final-redhat-00001
    fixed: vendor fix RHSA-2026:49701
  • Red Hat OpenShift AI 2.25 rhoai/odh-modelmesh-rhel9 1783443816, rhoai/odh-trustyai-service-rhel9 1788198681
    fixed: vendor fix RHSA-2026:42644
  • Red Hat OpenShift AI 3.4 rhoai/odh-trustyai-service-rhel9 1791792525
    fixed: vendor fix RHSA-2026:84734
  • Red Hat OpenShift Dev Spaces 3.28 devspaces/server-rhel9 1780694994, devspaces/openvsx-rhel9 1780948325, devspaces/pluginregistry-rhel9 1780696380
    fixed: vendor fix RHSA-2026:25123
  • Red Hat OpenShift Dev Spaces 3.29 devspaces/multicluster-redirector-rhel9 1782989027
    fixed: vendor fix RHSA-2026:36820
  • Red Hat Streams for Apache Kafka 3.2.1
    fixed: vendor fix RHSA-2026:54435
  • Red Hat Cryostat 4 on RHEL 9 cryostat/cryostat-db-rhel9 4.2.0-16, cryostat/cryostat-storage-rhel9 4.2.0-16, cryostat/cryostat-operator-bundle 4.2.0-8, cryostat/cryostat-rhel9-operator 4.2.0-15, cryostat/cryostat-agent-init-rhel9 0.7.0-8, cryostat/cryostat-grafana-dashboard-rhel9 4.2.0-10, +1 more
    not affected: vulnerable code not present
  • Red Hat build of Apache Camel 4 for Quarkus 3 netty-codec-http
    not affected: inline mitigations already exist
  • Red Hat Build of Keycloak netty-codec-http, rhbk-rhel9-operator, rhbk-openshift-rhel9 Red Hat build of Quarkus 3.27.4.redhat jna 5.8.0, db2 1.21.4, h2 2.3.230, y18n 5.0.8, cliui 8.0.1, guice 5.1.0, +1008 more Red Hat build of Quarkus 3.33.2.redhat jna 5.8.0, bson 5.6.4, h2 2.4.240, y18n 5.0.8, cliui 8.0.1, guice 5.1.0, +1017 more Red Hat JBoss Enterprise Application Platform 8.1.7.GA pom.xml, aesh 2.4, c3 0.6.4, d3 7.4.3, he 1.2.0, lr 1.4.2, +1866 more Red Hat OpenShift AI (RHOAI) rhoai/odh-modelmesh-rhel8, rhoai/odh-spark-operator-rhel9, rhoai/odh-trustyai-service-rhel8, rhoai/odh-th06-cpu-torch210-py312-rhel9, rhoai/odh-th06-cpu-torch291-py312-rhel9, rhoai/odh-th06-rocm64-torch291-py312-rhel9, +2 more
    not affected: vulnerable code not present

6 more not affected in the full advisory

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
5 mo ago

Exploit prediction

0.84% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/netty/netty/security/advisories/GHSA-57rv-r2g8-2cj3 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CISA ADP 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
GitHub 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
NVD 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected packages

ecosystem package affected fixed in
maven io.netty:netty-codec-http
>=4.2.0.Alpha1, <4.2.13.Final
<4.1.133.Final
4.2.13.Final
4.1.133.Final

Affected products

  • netty netty
  • io.netty netty-codec-http
  • Red Hat Cryostat 4 on RHEL 9
  • Red Hat Red Hat AMQ Broker 7.13.6
  • Red Hat Red Hat AMQ Broker 7.14.1
  • Red Hat Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16
  • Red Hat Red Hat build of Quarkus 3.27.4
  • Red Hat Red Hat build of Quarkus 3.33.2
  • Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
  • Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
  • Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9
  • Red Hat Red Hat JBoss Enterprise Application Platform 8.1.7.GA
  • Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
  • Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
  • Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
  • Red Hat Streams for Apache Kafka 3.2.1
  • Red Hat Red Hat OpenShift AI 2.25
  • Red Hat Red Hat OpenShift Dev Spaces 3.28
  • Red Hat Red Hat OpenShift Dev Spaces 3.29
  • Red Hat OpenShift Serverless
  • Red Hat Red Hat AMQ Clients
  • Red Hat Red Hat build of Apache Camel 4 for Quarkus 3
  • Red Hat Red Hat build of Apicurio Registry 2
  • Red Hat Red Hat build of Apicurio Registry 3
  • Red Hat Red Hat build of Debezium 3
  • Red Hat Red Hat Build of Keycloak
  • Red Hat Red Hat build of OptaPlanner 8
  • Red Hat Red Hat Data Grid 8
  • Red Hat Red Hat Enterprise Linux AI (RHEL AI) 3
  • Red Hat Red Hat Fuse 7
  • Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack
  • Red Hat Red Hat OpenShift AI (RHOAI)
  • Red Hat Red Hat Process Automation 7
  • Red Hat Red Hat Satellite 6
  • Red Hat Red Hat Single Sign-On 7
  • Red Hat streams for Apache Kafka 2

Classification

Weakness
  • CWE-444 Inconsistent Interpretation of HTTP Requests
Technology feeds

References

Sources

Fencer Vulns 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.