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    CVE-2026-116542

    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.

    Published:Oct 26, 2026
    Last Modified:Oct 31, 2026
    EPS:Oct 26, 2026
    EPSS Score:0.00208
    CVSS Score:5.3

    Affected Products

    Vendor
    Netty
    Product
    Netty-tcnative
    Vendor
    Netty
    Product
    Netty-tcnative-boringssl-static

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-71 Using Unicode Encoding to Bypass Validation Logic

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High