Bug 2521309 (CVE-2026-62243) - CVE-2026-62243 io.netty/netty-handler: Netty: TLS hostname verification bypass via OpenSSL client path misconfiguration
Summary: CVE-2026-62243 io.netty/netty-handler: Netty: TLS hostname verification bypas...
Keywords:
Status: NEW
Alias: CVE-2026-62243
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2526733 2526735 2526736 2526734
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-22 12:52 UTC by OSIDB Bzimport
Modified: 2026-10-21 07:35 UTC (History)
108 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:63302 0 None None None 2026-09-03 18:34:36 UTC
Red Hat Product Errata RHSA-2026:66488 0 None None None 2026-09-10 16:38:29 UTC
Red Hat Product Errata RHSA-2026:66545 0 None None None 2026-09-10 23:26:32 UTC
Red Hat Product Errata RHSA-2026:69296 0 None None None 2026-09-21 12:20:53 UTC
Red Hat Product Errata RHSA-2026:70228 0 None None None 2026-09-22 12:57:48 UTC
Red Hat Product Errata RHSA-2026:70229 0 None None None 2026-09-22 13:02:31 UTC
Red Hat Product Errata RHSA-2026:70230 0 None None None 2026-09-22 13:00:16 UTC
Red Hat Product Errata RHSA-2026:70277 0 None None None 2026-09-22 15:37:22 UTC
Red Hat Product Errata RHSA-2026:71675 0 None None None 2026-09-24 19:57:50 UTC
Red Hat Product Errata RHSA-2026:86676 0 None None None 2026-10-21 07:35:18 UTC

Description OSIDB Bzimport 2026-08-22 12:52:04 UTC 
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.
Comment 1 errata-xmlrpc 2026-09-03 18:34:30 UTC 
This issue has been addressed in the following products:

  Red Hat Build of Apache Camel 3.33 for Quarkus 3.33.3.SP1

Via RHSA-2026:63302 https://access.redhat.com/errata/RHSA-2026:63302
Comment 2 errata-xmlrpc 2026-09-10 16:38:24 UTC 
This issue has been addressed in the following products:

  Red Hat AMQ Broker 7.14.1

Via RHSA-2026:66488 https://access.redhat.com/errata/RHSA-2026:66488
Comment 3 errata-xmlrpc 2026-09-10 23:26:26 UTC 
This issue has been addressed in the following products:

  Red Hat AMQ Broker 7.13.6

Via RHSA-2026:66545 https://access.redhat.com/errata/RHSA-2026:66545
Comment 4 Jon Orris 2026-09-21 12:20:49 UTC 
This issue has been addressed in the following products:

  Red Hat Data Grid 8.6.3

Via RHSA-2026:69296 https://access.redhat.com/errata/RHSA-2026:69296
Comment 5 Jon Orris 2026-09-22 12:57:43 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

Via RHSA-2026:70228 https://access.redhat.com/errata/RHSA-2026:70228
Comment 6 Jon Orris 2026-09-22 13:00:10 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

Via RHSA-2026:70230 https://access.redhat.com/errata/RHSA-2026:70230
Comment 7 Jon Orris 2026-09-22 13:02:25 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

Via RHSA-2026:70229 https://access.redhat.com/errata/RHSA-2026:70229
Comment 8 Jon Orris 2026-09-22 15:37:16 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Enterprise Application Platform 8.1

Via RHSA-2026:70277 https://access.redhat.com/errata/RHSA-2026:70277
Comment 9 Jon Orris 2026-09-24 19:57:44 UTC 
This issue has been addressed in the following products:

  Red Hat build of Apache Camel 4.18.4 for Spring Boot 3.5.16

Via RHSA-2026:71675 https://access.redhat.com/errata/RHSA-2026:71675
Comment 10 Jon Orris 2026-10-21 07:35:13 UTC 
This issue has been addressed in the following products:

  Streams for Apache Kafka 3.2.2

Via RHSA-2026:86676 https://access.redhat.com/errata/RHSA-2026:86676
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