CVE-2026-102476: Flaw in Eclipse Vert.x Scores 9.1 on CVSS
A newly published critical vulnerability in Eclipse Vert.x carries a CVSS score of 9.1. Here is what is affected and how to respond.
Key points
- CVE-2026-102476 affects Eclipse Vert.x.
- CVSS 9.1 (Critical).
- No exploitation confirmed yet.
A critical security flaw tracked as CVE-2026-102476 has been published in the National Vulnerability Database for Eclipse Vert.x, with a CVSS base score of 9.1.
At a glance
- CVE
- CVE-2026-102476
- Product
- Eclipse Vert.x
- CVSS
- 9.1 Critical
- Weakness
- —
- Exploited
- No known exploitation
What is the vulnerability?
The NVD entry states: 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.
Affected versions
| Vendor | Product | Versions |
|---|---|---|
| Eclipse Foundation | Eclipse Vert.x | up to 5.0.12, up to 5.1.9, 5.2.0 |
Is it being exploited?
There is no public confirmation of exploitation at the time of publication. It does not appear in CISA's Known Exploited Vulnerabilities catalog. We will update this report if that changes.
What should you do?
- Identify whether the affected product and versions run in your environment.
- Apply the vendor update listed in the advisory as soon as it is available.
- Limit network exposure of the affected service until it is patched.
- Monitor the vendor advisory for updated guidance or exploitation reports.
What to do and how to stay safe: CVE-2026-102476
- Vulnerability severity scores ignore your specific architecture and context.
- Exploitability depends on network exposure and user behavior, not just code flaws.
- Prioritization requires continuous asset inventory and threat intelligence alignment.
Risk-based vulnerability management focuses your limited resources on the flaws that actually threaten your business. Start by mapping your critical assets and checking for active exploits to prioritize your backlog.
Step-by-step guide: Risk-Based Vulnerability Management: Prioritize Fixes by Actual Danger
General security guidance from the Threat Times newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
What is CVE-2026-102476?
CVE-2026-102476 is a security vulnerability in Eclipse Vert.x.
How severe is CVE-2026-102476?
It has a CVSS score of 9.1 Critical.
Is CVE-2026-102476 being exploited?
There is no public confirmation of exploitation at the time of publication.
