Description
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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
netty netty
Default version status: unaffected
4.2.0.Final to < 4.2.16.Finalaffected4.2.16.Finalunaffected
pkg:maven/io.netty/netty-handlernetty netty
Default version status: unaffected
0 to < 4.1.137.Finalaffected4.1.137.Finalunaffected
pkg:maven/io.netty/netty-handler