CVE-2026-116542
Medium
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.
SeverityMedium
CVSS5.3
Exploit probability—
ProductNetty-tcnative
PublishedOct 26, 2026
First seenOct 26, 2026
Weakness typeCWE-176CWE-176
How to fix
Update
- netty netty-tcnative2.0.84.Final or later
- netty netty-tcnative-boringssl-static2.0.84.Final or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| netty netty-tcnative | v < 2.0.84.Final | 2.0.84.Final |
| netty netty-tcnative-boringssl-static | v < 2.0.84.Final | 2.0.84.Final |
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