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.
Published: 2026-10-26
Score: 6.9 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Sat, 31 Oct 2026 02:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 26 Oct 2026 19:15:00 +0000

Type Values Removed Values Added
First Time appeared Netty
Netty netty-tcnative
Netty netty-tcnative-boringssl-static
Vendors & Products Netty
Netty netty-tcnative
Netty netty-tcnative-boringssl-static

Mon, 26 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
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.
Title Netty netty-tcnative before 2.0.84.Final SNI Hostname Spoofing via Modified UTF-8 Decoding
Weaknesses CWE-176
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N'}


Subscriptions

Netty Netty-tcnative Netty-tcnative-boringssl-static
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-31T01:27:08.152Z

Reserved: 2026-10-26T14:30:58.474Z

Link: CVE-2026-116542

cve-icon Vulnrichment

Updated: 2026-10-31T01:27:00.703Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-26T16:17:19.680

Modified: 2026-10-31T02:17:32.720

Link: CVE-2026-116542

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-26T18:49:48Z

Weaknesses