Is CVE-2026-116542 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-116542?

CVE-2026-116542 has a CVSS v3 severity of MEDIUM (5.3).

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CVE-2026-116542

Description

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.