{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-50010: Netty's wrapping plain trust manager silently disables hostname verification","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-50010","status":"final","version":"1","initial_release_date":"2026-06-12T14:50:43.151Z","current_release_date":"2026-06-12T16:39:07.045Z","revision_history":[{"date":"2026-06-12T14:50:43.151Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"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.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-50010 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-50010"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-50010"},{"category":"external","summary":"https://github.com/netty/netty/security/advisories/GHSA-c653-97m9-rcg9","url":"https://github.com/netty/netty/security/advisories/GHSA-c653-97m9-rcg9"},{"category":"external","summary":"https://github.com/netty/netty/releases/tag/netty-4.1.135.Final","url":"https://github.com/netty/netty/releases/tag/netty-4.1.135.Final"},{"category":"external","summary":"https://github.com/netty/netty/releases/tag/netty-4.2.15.Final","url":"https://github.com/netty/netty/releases/tag/netty-4.2.15.Final"}]},"product_tree":{"branches":[{"category":"vendor","name":"netty","branches":[{"category":"product_name","name":"netty","branches":[{"category":"product_version","name":">= 4.2.0.Final, < 4.2.15.Final","product":{"name":"netty netty >= 4.2.0.Final, < 4.2.15.Final","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"< 4.1.135.Final","product":{"name":"netty netty < 4.1.135.Final","product_id":"CSAFPID-2","product_identification_helper":{"cpe":"cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-50010","title":"Netty's wrapping plain trust manager silently disables hostname verification","notes":[{"category":"description","text":"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.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1","CSAFPID-2"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","baseScore":7.5,"baseSeverity":"HIGH"},"products":["CSAFPID-1","CSAFPID-2"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1","CSAFPID-2"]}]}]}