CVE-2026-102476

Hostname Validation Bypass in Vert.x HTTP Client

Published Oct 14, 2026 CVSS 4.0 · 9.1 Critical EPSS < 1% KEV · Not listed
Description
In Eclipse Vert.x versions [5.0.0,5.0.12] or [5.1.0,5.1.9] or [5.2.0, 5.2.0], the Vert.x HTTP client relies on an SSL context for efficiency purpose, the key of this cache should reflect entirely the SSL semantics of the desired SSL properties. It is possible for a client to ask for an SSL context and obtain an SSL context with weaker properties, for instance a context with hostname validation and obtain a context ignoring hostname validation.



The impacted component is io.vertx:vertx-core.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Eclipse
Eclipse vert.x
Eclipse Foundation
Eclipse Foundation vert.x
Vendors & Products Eclipse
Eclipse vert.x
Eclipse Foundation
Eclipse Foundation vert.x
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title Hostname Validation Bypass in Vert.x HTTP Client
Weaknesses CWE-295
Type Values Removed Values Added
Description In Eclipse Vert.x versions [5.0.0,5.0.12] or [5.1.0,5.1.9] or [5.2.0, 5.2.0], the Vert.x HTTP client relies on an SSL context for efficiency purpose, the key of this cache should reflect entirely the SSL semantics of the desired SSL properties. It is possible for a client to ask for an SSL context and obtain an SSL context with weaker properties, for instance a context with hostname validation and obtain a context ignoring hostname validation. The impacted component is io.vertx:vertx-core.
References
Metrics cvssV4_0

{'score': 9.1, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
eclipse
Published
Updated
Oct 16, 2026, 6:20 PM
Reserved
Sep 29, 2026, 8:41 AM
Status
Awaiting Analysis
Published
Oct 14, 2026, 6:17 PM
Modified
Oct 16, 2026, 7:17 PM