Netty netty-tcnative/netty-tcnative-boringssl-static up to 2.0.83.Final SNI Hostname NewStringUTF certificate validation

CVSS Meta Temp Score
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CTI Interest Score
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4.4$0-$5k2.45

Summaryinfo

A vulnerability categorized as problematic has been discovered in Netty netty-tcnative and netty-tcnative-boringssl-static up to 2.0.83.Final. Affected by this issue is the function NewStringUTF of the component SNI Hostname. The manipulation results in certificate validation. This vulnerability is cataloged as CVE-2026-116542. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Netty netty-tcnative and netty-tcnative-boringssl-static up to 2.0.83.Final. Affected is the function NewStringUTF of the component SNI Hostname. The manipulation with an unknown input leads to a certificate validation vulnerability. CWE is classifying the issue as CWE-295. The product does not validate, or incorrectly validates, a certificate. This is going to have an impact on integrity. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-116542 since 10/26/2026. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1587.003.

Upgrading to version 2.0.84.Final eliminates this vulnerability.

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Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 4.5
VulDB Meta Temp Score: 4.4

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.3
CNA Vector (VulnCheck): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Certificate validation
CWE: CWE-295 / CWE-287
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: netty-tcnative/netty-tcnative-boringssl-static 2.0.84.Final

Timelineinfo

10/26/2026 Advisory disclosed
10/26/2026 +0 days CVE reserved
10/26/2026 +0 days VulDB entry created
10/26/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-116542 (🔒)
GCVE (CVE): GCVE-0-2026-116542
GCVE (VulDB): GCVE-100-426504

Entryinfo

Created: 10/26/2026 16:40
Changes: 10/26/2026 16:40 (77)
Complete: 🔍
Cache ID: 216::103

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