A TCP client can perform a TLS handshake and present the server name extension with a server name that is accepted by a server wildcard name, e.g. if the server is configured with a certificate accepting *.example.com, any XYZ.example.com where xyz is a valid name can be used.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact Low

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Eclipse Foundation Eclipse Vert.x unaffected
Version Status Constraints
4.3.4 affected ≤ 4.5.26
5.0.0 affected ≤ 5.0.11

No data.

No data.

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Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/eclipse-vertx/vert.x/pull/6102 cve-icon cve-icon
https://github.com/eclipse-vertx/vert.x/security/advisories/GHSA-3g76-f9xq-8vp6 cve-icon cve-icon
https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/381 cve-icon cve-icon
History

Wed, 06 May 2026 12:00:00 +0000

Type Values Removed Values Added
Title Wildcard Server Name Misuse in TLS Handshake Enables Client to Connect to Any Subdomain
Weaknesses CWE-295

Wed, 06 May 2026 10:00:00 +0000

Type Values Removed Values Added
Description A TCP client can perform a TLS handshake and present the server name extension with a server name that is accepted by a server wildcard name, e.g. if the server is configured with a certificate accepting *.example.com, any XYZ.example.com where xyz is a valid name can be used.
References
Metrics cvssV4_0

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

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: eclipse

Published:

Updated: 2026-05-06T09:55:12.531Z

Reserved: 2026-04-22T13:02:37.222Z

Link: CVE-2026-6860

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-05-06T10:16:26.293

Modified: 2026-05-06T10:16:26.293

Link: CVE-2026-6860

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-06T11:45:03Z

Weaknesses