{"id":"CVE-2026-50010","aliases":["GHSA-c653-97m9-rcg9"],"url":"https://o3.security/vulnerability/CVE-2026-50010","summary":"Netty's wrapping plain trust manager silently disables hostname verification","details":"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.","published":"2026-06-12T14:50:43.151Z","modified":"2026-08-11T03:30:11.491134491Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},"epss":{"score":0.00456,"percentile":0.37411,"asOf":"2026-08-09"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"io.netty:netty-handler","fixedVersion":"4.2.15.Final"},{"ecosystem":"Maven","name":"io.netty:netty-handler","fixedVersion":"4.1.135.Final"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/netty/netty/releases/tag/netty-4.1.135.Final"},{"type":"WEB","url":"https://github.com/netty/netty/releases/tag/netty-4.2.15.Final"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-50010.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:26017"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:26018"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:26586"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:28573"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34608"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:37390"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:41951"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:48151"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:49700"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:49701"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-50010"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50010.json"},{"type":"ADVISORY","url":"https://github.com/netty/netty/security/advisories/GHSA-c653-97m9-rcg9"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50010"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2488429"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-11T03:30:11.491134491Z"}}