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CVE-2026-116542 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:5.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/netty/netty-tcnative/security/advisories/GHSA-2784-hxmm-4hgf	CISA-ADP
https://github.com/netty/netty-tcnative	[email protected]
https://github.com/netty/netty-tcnative/blob/netty-tcnative-parent-2.0.83.Final/openssl-dynamic/src/main/c/sslcontext.c#L2608	[email protected]
https://github.com/netty/netty-tcnative/commit/a879c85b9776cf478aada3ca69e60b8c0a99ed38	[email protected]
https://github.com/netty/netty-tcnative/releases/tag/netty-tcnative-parent-2.0.84.Final	[email protected]
https://github.com/netty/netty-tcnative/security/advisories/GHSA-2784-hxmm-4hgf	[email protected]
https://www.vulncheck.com/advisories/netty-netty-tcnative-before-2.0.84-final-sni-hostname-spoofing-via-modified-utf-8-decoding	[email protected]

see all 7 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-176	Improper Handling of Unicode Encoding	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

Date	Action	Recorded By
Oct 31, 2026	CVE Modified	CISA-ADP
Oct 26, 2026	New CVE Received	[email protected]