---
id: CVE-2026-62243
title: >-
  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 use…
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 use…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-297
  - CWE-295
vendor: Red Hat
product: Red Hat Ceph Storage 9
affected:
  - exploit_intelligence
  - openshift_serverless
  - amq_broker 7
  - build_of_apache_camel_4_for_quarkus 3
  - build_of_apache_camel_for_spring_boot 4
  - build_of_apicurio_registry 3
  - build_of_debezium 3
  - build_of_keycloak
  - build_of_quarkus
  - ceph_storage 6
  - ceph_storage 7
  - ceph_storage 8
  - ceph_storage 9
  - data_grid 8
  - enterprise_linux 10
  - enterprise_linux_ai_rhel_ai 3
  - fuse 7
  - jboss_enterprise_application_platform 7
  - jboss_enterprise_application_platform 8
  - jboss_enterprise_application_platform_expansion_pack
  - openshift_ai_rhoai
  - openshift_dev_spaces
  - satellite 6
  - single_sign_on 7
  - build_of_apache_camel_3_33_for_quarkus 3.33.3.SP1
patched:
  - build_of_apache_camel_3_33_for_quarkus 3.33.3.SP1
published: '2026-08-22'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T20:46:19.780'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-62243'
references:
  - url: 'https://github.com/netty/netty/security/advisories/GHSA-p85m-gvr3-788c'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/netty-through-tls-hostname-verification-bypass
    label: disclosure@vulncheck.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-62243.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-62243'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2521309'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-62243'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-62243'
  - url: 'https://access.redhat.com/errata/RHSA-2026:63302'
  - url: 'https://access.redhat.com/errata/RHSA-2026:66545'
  - url: 'https://access.redhat.com/errata/RHSA-2026:66488'
  - url: 'https://access.redhat.com/errata/RHSA-2026:68276'
  - url: 'https://access.redhat.com/errata/RHSA-2026:68280'
  - url: 'https://access.redhat.com/errata/RHSA-2026:68278'
  - url: 'https://access.redhat.com/errata/RHSA-2026:68277'
  - url: 'https://access.redhat.com/errata/RHSA-2026:69296'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
epss: 0.00155
epssPercentile: 0.0502
ingestedAt: '2026-08-23T04:42:14.622Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **RHSA-2026:63302** · Red Hat · fixed in: Red Hat Build of Apache Camel 3.33 for Quarkus 3.33.3.SP1 · released 2026-09-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:63302)
- **Red Hat VEX** · Important · affected: Exploit Intelligence, OpenShift Serverless, Red Hat build of Apache Camel 4 for Quarkus 3, Red Hat build of Apache Camel for Spring Boot 4, Red Hat build of Apicurio Registry 3, Red Hat build of Debezium 3, … · no fix planned: Red Hat Fuse 7, Red Hat JBoss Enterprise Application Platform 7, Red Hat Ceph Storage 6, Red Hat Ceph Storage 7, … · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-62243.json)
- **RHSA-2026:66545** · Red Hat · fixed in: Red Hat AMQ Broker 7.13.6 · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66545)
- **RHSA-2026:66488** · Red Hat · fixed in: Red Hat AMQ Broker 7.14.1 · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66488)
- **RHSA-2026:68276** · Red Hat · fixed in: Red Hat build of Keycloak 26.4 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68276)
- **RHSA-2026:68280** · Red Hat · fixed in: Red Hat build of Keycloak 26.4.16 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68280)
- **RHSA-2026:68278** · Red Hat · fixed in: Red Hat build of Keycloak 26.6.7 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68278)
- **RHSA-2026:68277** · Red Hat · fixed in: Red Hat build of Keycloak 26.6 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68277)
- **RHSA-2026:69296** · Red Hat · fixed in: Red Hat Data Grid 8.6.3 · released 2026-09-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:69296)