CVE WatchOct 26, 2026

CVE-2026-116542

Netty netty-tcnative before 2.0.84.Final contains an SNI hostname spoofing vulnerability that allows remote unauthenticated clients to alter

CVSS

5.3

Medium

EPSS

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KEV

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Exploit Today

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0-100

Published: Oct 26, 2026 · Last modified: Oct 26, 2026 · CWE-176

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references

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