CVE-2026-50010

Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, SimpleTrustManagerFactory.engineGetTrustManagers() and related paths wrap any user-supplied plain X509TrustManager in X509TrustManagerWrapper, which extends X509ExtendedTrustManager but implements the 3-arg checkServerTrusted(chain, authType, SSLEngine) by discarding the SSLEngine and calling the 2-arg delegate. Because the object now IS an X509ExtendedTrustManager, neither SunJSSE's internal AbstractTrustManagerWrapper nor Netty's own OpenSslX509TrustManagerWrapper will re-wrap it to add endpoint-identification. Consequently, even though Netty 4.2 sets endpointIdentificationAlgorithm="HTTPS" by default, a client built with `SslContextBuilder.forClient().trustManager(somePlainX509TrustManager)` performs no hostname verification at all. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

• CWE-347
• CWE-347

• https://github.com/netty/netty/releases/tag/netty-4.1.135.FinalRelease Notes
• https://github.com/netty/netty/releases/tag/netty-4.2.15.FinalRelease Notes
• https://github.com/netty/netty/security/advisories/GHSA-c653-97m9-rcg9Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:26017
• https://access.redhat.com/errata/RHSA-2026:26018
• https://access.redhat.com/errata/RHSA-2026:26586
• https://access.redhat.com/errata/RHSA-2026:28573
• https://access.redhat.com/errata/RHSA-2026:34608
• https://access.redhat.com/errata/RHSA-2026:37390
• https://access.redhat.com/errata/RHSA-2026:41951
• https://access.redhat.com/errata/RHSA-2026:48151
• https://access.redhat.com/errata/RHSA-2026:49700
• https://access.redhat.com/errata/RHSA-2026:49701
• https://access.redhat.com/errata/RHSA-2026:53644
• https://access.redhat.com/errata/RHSA-2026:53806
• https://access.redhat.com/security/cve/CVE-2026-50010
• https://bugzilla.redhat.com/show_bug.cgi?id=2488429
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-50010.json

Published

Jun 12, 2026

Last Modified

Aug 12, 2026

Status

Modified

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