Threats affecting pkg:maven/netty/io.netty:netty-tcnative

CVE-2026-116542 is a vulnerability in netty-tcnative versions before 2.0.84.Final that allows remote unauthenticated clients to spoof SNI hostnames by exploiting improper handling of Unicode encoding in JNI NewStringUTF decoding. Attackers can use overlong encodings in the ClientHello server_name field to manipulate SNI-based certificate selection, access control decisions, and logging.

CVE-2026-116541 is a denial of service vulnerability in netty-tcnative versions before 2.0.84.Final. The flaw occurs in the tcn_write_to_bytebuffer BIO write callback, which incorrectly calculates bytes consumed. This can be exploited by remote TLS 1.3 peers sending queued post-handshake records such as NewSessionTicket or KeyUpdate, causing truncated flights, connection failures, or JVM process aborts.

netty-tcnative 2.0.66.Final before 2.0.84.Final built against OpenSSL 3.x contains a use-after-free vulnerability in ssl_tlsext_ticket_key_cb during session ticket key rotation. Remote clients performing TLS handshakes while setSessionTicketKeys0 frees the shared key array cause OpenSSL to read freed HMAC keys, crashing or corrupting ticket processing.

CVE-2026-116539 is a heap buffer overflow vulnerability in netty-tcnative before version 2.0.84.Final. It occurs in the tcn_write_to_bytebuffer BIO callback due to improper handling of the ring buffer write index. Remote TLS peers can exploit this during handshake, renegotiation, or post-handshake messages to trigger an out-of-bounds memory copy, causing the JVM process to crash.