Eclipse Vert.x up to 5.0.12/5.1.9/5.2.0 io.vertx:vertx-core certificate host validation

Summaryinfo

A vulnerability labeled as problematic has been found in Eclipse Vert.x up to 5.0.12/5.1.9/5.2.0. This affects an unknown part of the component io.vertx:vertx-core. Such manipulation leads to certificate host validation. This vulnerability is referenced as CVE-2026-102476. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in Eclipse Vert.x up to 5.0.12/5.1.9/5.2.0. It has been rated as problematic. Affected by this issue is an unknown part of the component io.vertx:vertx-core. The manipulation with an unknown input leads to a certificate host validation vulnerability. Using CWE to declare the problem leads to CWE-297. The product communicates with a host that provides a certificate, but the product does not properly ensure that the certificate is actually associated with that host. Impacted is integrity. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-102476 since 09/29/2026. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/14/2026). This vulnerability is assigned to T1587.003 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• Eclipse

Name

• Vert.x

Version

• 5.0
• 5.0.0
• 5.0.1
• 5.0.2
• 5.0.3
• 5.0.4
• 5.0.5
• 5.0.6
• 5.0.7
• 5.0.8
• 5.0.9
• 5.0.10
• 5.0.11
• 5.0.12
• 5.1
• 5.1.0
• 5.1.1
• 5.1.2
• 5.1.3
• 5.1.4
• 5.1.5
• 5.1.6
• 5.1.7
• 5.1.8
• 5.1.9
• 5.2.0

License

• open-source

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CPE 2.2info

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Entryinfo

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