Skip to content
Fencer Intel
high 7.5

CVE-2026-62243 json

Netty 4.2.0 through 4.2.16 TLS Hostname Verification Bypass

published 3mo ago modified 28d ago also EUVD-2026-64271 , GHSA-p85m-gvr3-788c

Unreviewed: the maintainers' own advisory

Published by the maintainers on their GitHub repository netty/netty. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 4%
public exploits
0
none known

Summary

Netty (io.netty:netty-handler) versions from 4.2.0.Final through 4.2.16.Final and versions through 4.1.136.Final disable TLS hostname verification on the SslProvider.OPENSSL client path when a plain (non-extended) X509TrustManager is used and Unsafe-based trust-manager wrapping is unavailable (Java 25+). In this configuration the OpenSSL client does not perform hostname verification, allowing a man-in-the-middle attacker to present a certificate issued for a different hostname that is accepted without validation. Fixed in 4.2.17.Final and 4.1.137.Final.

Patch / fix

  • netty netty 4.1.137.Final, 4.2.16.Final
  • eap8-jaxb jboss enterprise application platform 8.1 4.0.7-4.redhat_00001.1.el10eap
  • eap8-txw2 jboss enterprise application platform 8.1 4.0.7-4.redhat_00001.1.el10eap
  • eap8-xsom jboss enterprise application platform 8.1 4.0.7-4.redhat_00001.1.el10eap
  • eap8-log4j jboss enterprise application platform 8.1 2.25.4-1.redhat_00003.1.el10eap
  • eap8-netty jboss enterprise application platform 8.1 4.1.136-1.Final_redhat_00001.1.el10eap
  • eap8-rngom jboss enterprise application platform 8.1 4.0.7-4.redhat_00001.1.el10eap
  • eap8-slf4j jboss enterprise application platform 8.1 2.0.18-1.redhat_00001.1.el10eap
  • eap8-neethi jboss enterprise application platform 8.1 3.2.2-1.redhat_00001.1.el10eap

red hat advisories RHSA-2026:70230RHSA-2026:70229RHSA-2026:70228

  • netty-tcnative SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 2.0.84-150200.3.51.1
  • netty SLE Module for Package Hub 15 SP7 4.1.138-150200.4.56.1

suse advisories SUSE-SU-2026:4391-1

  • netty openSUSE Tumbleweed 4.1.138-1.1

opensuse advisories openSUSE-SU-2026:11882-1

Is CVE-2026-62243 in your stack? 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-2026-62243 updated cvss 7.5

io.netty/netty-handler: Netty: TLS hostname verification bypass via OpenSSL client path misconfiguration

  • Red Hat Exploit Intelligence exploit-intelligence/agent-client-rhel9 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 build of Apache Camel 4 for Quarkus 3 netty-handler 4.1.136.Final-redhat-00001 Red Hat build of Apicurio Registry 3 netty-handler 4.1.136.Final-redhat-00001
    affected: workaround, no fix available
  • Red Hat Ceph Storage 6 ceph, cephadm, librbd1, librgw2, rbd-nbd, ceph-mib, +16 more Red Hat Ceph Storage 7 ceph, cephadm, librbd1, librgw2, rbd-nbd, ceph-mib, +16 more Red Hat Ceph Storage 8 ceph, cephadm, librbd1, librgw2, rbd-nbd, ceph-mib, +17 more Red Hat Ceph Storage 9 ceph, cephadm, librbd1, librgw2, rbd-nbd, ceph-mib, +19 more
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux 10 ceph Red Hat Enterprise Linux AI (RHEL AI) 3 bazel6 6.5.0-2.el9ai, bazel7 7.7.1-1.el9ai, bazel8 8.6.0-1.el9ai
    affected: workaround, no fix available
  • Red Hat Fuse 7 netty-handler 4.1.136.Final-redhat-00001 Red Hat JBoss Enterprise Application Platform 7 netty-handler 4.1.136.Final-redhat-00001, jboss-eap-7/eap74-els-openjdk8-openshift-rhel8, jboss-eap-7/eap74-els-openjdk11-openshift-rhel8, jboss-eap-7/eap74-els-openjdk17-openshift-rhel8
    affected: workaround, no fix planned “Will not fix”
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-th06-cpu-torch291-py312-rhel9, rhoai/odh-th06-cuda130-torch291-py312-rhel9
    affected: workaround, no fix available
  • Red Hat Single Sign-On 7 netty-handler 4.1.136.Final-redhat-00001
    affected: workaround, no fix planned “Will not fix”
  • 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
show 21 more
  • Red Hat Build of Apache Camel 3.33.3.SP1 netty-handler 4.1.137.Final-redhat-00001
    fixed: vendor fix RHSA-2026:63302
  • Red Hat build of Apache Camel 4.18.4 for Spring Boot 3.5.16
    fixed: vendor fix RHSA-2026:71675
  • Red Hat Build of Debezium 3.6
    fixed: vendor fix RHSA-2026:83612
  • Red Hat build of Keycloak 26.4 rhbk/keycloak-rhel9 26.4-26, rhbk/keycloak-rhel9-operator 26.4-26, rhbk/keycloak-operator-bundle 26.4.16-2
    fixed: vendor fix RHSA-2026:68276
  • Red Hat build of Keycloak 26.4.16
    fixed: vendor fix RHSA-2026:68280
  • Red Hat build of Keycloak 26.6 rhbk/keycloak-rhel9 26.6-20, rhbk/keycloak-rhel9-operator 26.6-20, rhbk/keycloak-operator-bundle 26.6.7-3
    fixed: vendor fix RHSA-2026:68277
  • Red Hat build of Keycloak 26.6.7
    fixed: vendor fix RHSA-2026:68278
  • Red Hat build of Quarkus 3.27.5.SP1 netty-handler 4.1.137.Final-redhat-00001
    fixed: vendor fix RHSA-2026:62515
  • Red Hat build of Quarkus 3.33.3.SP1 netty-handler 4.1.137.Final-redhat-00001
    fixed: vendor fix RHSA-2026:62555
  • Red Hat Data Grid 8.6.3
    fixed: vendor fix RHSA-2026:69296
  • Red Hat JBoss EAP 8.1 for RHEL 8 eap8-jaxb 4.0.7-4.redhat_00001.1.el8eap, eap8-txw2 4.0.7-4.redhat_00001.1.el8eap, eap8-xsom 4.0.7-4.redhat_00001.1.el8eap, eap8-rngom 4.0.7-4.redhat_00001.1.el8eap, eap8-log4j 2.25.4-1.redhat_00003.1.el8eap, eap8-neethi 3.2.2-1.redhat_00001.1.el8eap, +101 more
    fixed: vendor fix RHSA-2026:70228
  • Red Hat JBoss EAP 8.1 for RHEL 9 eap8-jaxb 4.0.7-4.redhat_00001.1.el9eap, eap8-txw2 4.0.7-4.redhat_00001.1.el9eap, eap8-xsom 4.0.7-4.redhat_00001.1.el9eap, eap8-rngom 4.0.7-4.redhat_00001.1.el9eap, eap8-log4j 2.25.4-1.redhat_00003.1.el9eap, eap8-neethi 3.2.2-1.redhat_00001.1.el9eap, +101 more
    fixed: vendor fix RHSA-2026:70229
  • Red Hat JBoss EAP 8.1 for RHEL 10 eap8-jaxb 4.0.7-4.redhat_00001.1.el10eap, eap8-txw2 4.0.7-4.redhat_00001.1.el10eap, eap8-xsom 4.0.7-4.redhat_00001.1.el10eap, eap8-rngom 4.0.7-4.redhat_00001.1.el10eap, eap8-log4j 2.25.4-1.redhat_00003.1.el10eap, eap8-neethi 3.2.2-1.redhat_00001.1.el10eap, +100 more
    fixed: vendor fix RHSA-2026:70230
  • Red Hat JBoss Enterprise Application Platform 8.1.8.GA netty-handler 4.1.136.Final-redhat-00001
    fixed: vendor fix RHSA-2026:70277
  • Red Hat OpenShift AI 2.25 rhoai/odh-modelmesh-rhel9 1790881700, rhoai/odh-trustyai-service-rhel9 1790933094
    fixed: vendor fix RHSA-2026:87410
  • Red Hat OpenShift AI 3.4 rhoai/odh-spark-operator-rhel9 1790958993, rhoai/odh-trustyai-service-rhel9 1791792525, rhoai/odh-th06-cpu-torch210-py312-rhel9 1791874335, rhoai/odh-th06-rocm64-torch291-py312-rhel9 1791872119, rhoai/odh-th06-cuda130-torch210-py312-rhel9 1791961113
    fixed: vendor fix RHSA-2026:84734
  • Red Hat OpenShift AI 3.5 rhoai/odh-trustyai-service-rhel9 1791951741
    fixed: vendor fix RHSA-2026:86891
  • Red Hat OpenShift Dev Spaces 3.31 devspaces/server-rhel9 1792775639, devspaces/openvsx-rhel9 1792494821, devspaces/jetbrains-ide-rhel9 1792476427, devspaces/pluginregistry-rhel9 1792495212, devspaces/multicluster-redirector-rhel9 1792491532
    fixed: vendor fix RHSA-2026:90321
  • Red Hat Build of Apache Camel 3.33.3.SP1 jimfs 1.1, jna 5.8.0, bcel 6.7.0, gax 2.74.1, icu4j 78.2, joni 2.2.6, +1618 more Red Hat build of Quarkus 3.27.5.SP1 jna 5.8.0, db2 1.21.4, h2 2.3.230, y18n 5.0.8, cliui 8.0.1, guice 5.1.0, +1009 more Red Hat build of Quarkus 3.33.3.SP1 jna 5.8.0, h2 2.4.240, y18n 5.0.8, cliui 8.0.1, guice 5.1.0, wasm 2.15.3, +1018 more Red Hat JBoss Enterprise Application Platform 8.1.8.GA pom.xml, aesh 2.4, c3 0.6.4, d3 7.4.3, he 1.2.0, lr 1.4.2, +1868 more
    not affected: vulnerable code not present
  • Red Hat JBoss Enterprise Application Platform Expansion Pack netty-handler 4.1.136.Final-redhat-00001
    not affected: component not present
  • Red Hat Offline Knowledge Portal offline-knowledge-portal/rhokp-rhel9
    not affected: vulnerable code not in execute path

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
none
Automatable
yes
Technical impact
partial
Assessed
2mo ago

Exploit prediction

0.16% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • netty netty

Classification

Weakness
  • CWE-297 Improper Validation of Certificate with Host Mismatch

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.

The maintainers of netty/netty published their own advisory on GitHub. Reviewed sources take precedence over it.

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