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CVE-2026-116542— Netty netty-tcnative before 2.0.84.Final SNI Hostname Spoofing via Modified UTF-8 Decoding

Quick assessment

Affected
netty netty-tcnative
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Netty 的 netty-tcnative 组件在 2.0.84.Final 版本之前存在一个 SNI 主机名伪造漏洞。该漏洞允许远程未认证客户端通过 JNI 的 NewStringUTF 解码机制篡改主机名。攻击者可以在 ClientHello 消息的 server_name 字段中发送超长编码（例如 0xC0 0x80），从而干扰基于 SNI 的证书选择、访问控制决策以及日志记录功能。

CVSS 5.3 · Medium
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I. Basic Information for CVE-2026-116542

Vulnerability Information
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Vulnerability Title
Netty netty-tcnative before 2.0.84.Final SNI Hostname Spoofing via Modified UTF-8 Decoding
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
Unicode编码处理不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
netty netty-tcnative 0 ~ 2.0.84.Final -
netty netty-tcnative-boringssl-static 0 ~ 2.0.84.Final -

II. Public POCs for CVE-2026-116542

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-116542

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Patches & Fixes for CVE-2026-116542 (1)

Vendor Advisories for CVE-2026-116542 (1)

Vendor Pages for CVE-2026-116542 (2)

Same Patch Batch · netty · 2026-10-26 · 4 CVEs total

CVE-2026-116541 5.9 MEDIUM netty-tcnative before 2.0.84.Final Denial of Service via BIO Write Overcount
CVE-2026-116539 5.9 MEDIUM Netty netty-tcnative before 2.0.84.Final Heap Buffer Overflow via OpenSSL BIO
CVE-2026-116540 5.9 MEDIUM netty-tcnative 2.0.66.Final before 2.0.84.Final Use-After-Free in Session Ticket Callback

IV. Related Vulnerabilities

Same product: netty-tcnative
Same vendor: netty
Same weakness: CWE-176