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CVE-2026-116539

Netty netty-tcnative before 2.0.84.Final Heap Buffer Overflow via OpenSSL BIO

Netty netty-tcnative before 2.0.84.Final contains a heap buffer overflow vulnerability in the tcn_write_to_bytebuffer BIO callback caused by failing to wrap the non-application ring buffer write index. Remote TLS peers can drive handshake, renegotiation, or post-handshake messages into this buffer, triggering an out-of-bounds memcpy that crashes the JVM process.

CVSS 4.0 · 8.2 High EPSS < 1% KEV · Not listed
Vendors
Netty
Products
Netty-tcnative Netty-tcnative-boringssl-static
CVE-2026-116542

Netty netty-tcnative before 2.0.84.Final SNI Hostname Spoofing via Modified UTF-8 Decoding

Netty netty-tcnative before 2.0.84.Final contains an SNI hostname spoofing vulnerability that allows remote unauthenticated clients to alter hostnames via JNI NewStringUTF decoding. Attackers can send overlong encodings like 0xC0 0x80 in the ClientHello server_name to confuse SNI-based certificate selection, access decisions, and logging.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Netty
Products
Netty-tcnative Netty-tcnative-boringssl-static
CVE-2026-116541

netty-tcnative before 2.0.84.Final Denial of Service via BIO Write Overcount

Netty netty-tcnative before 2.0.84.Final contains a denial of service vulnerability in the tcn_write_to_bytebuffer BIO write callback that overreports bytes consumed. Remote TLS 1.3 peers can provoke queued post-handshake records like NewSessionTicket or KeyUpdate to truncate flights, fail connections, or abort the JVM process.

CVSS 4.0 · 8.2 High EPSS < 1% KEV · Not listed
Vendors
Netty
Products
Netty-tcnative Netty-tcnative-boringssl-static
CVE-2026-116540

netty-tcnative 2.0.66.Final before 2.0.84.Final Use-After-Free in Session Ticket Callback

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.

CVSS 4.0 · 8.2 High EPSS < 1% KEV · Not listed
Vendors
Netty
Products
Netty-tcnative