CVE-2026-102476 Eclipse Foundation CVE debrief

Who should care

Eclipse Vert.x users and administrators should assess their exposure and verify their configurations to ensure they are not using vulnerable versions. Relevant roles include Eclipse Vert.x users and administrators. The vulnerability supports the consequence of potential security risks due to weaker SSL properties and requires verification of SSL context configuration.

Why it matters

CVE-2026-102476 is a critical vulnerability in Eclipse Vert.x that allows clients to obtain an SSL context with weaker properties than requested. Defenders should care because it may lead to security risks if not properly addressed. Relevant roles include Eclipse Vert.x users and administrators. The vulnerability supports the consequence of potential security risks due to weaker SSL properties and requires verification of SSL context configuration.

• Potential security risks due to weaker SSL properties
• Need to verify SSL context configuration
• Possible exposure in certain deployment contexts

Technical summary

The Vert.x HTTP client in Eclipse Vert.x relies on an SSL context for efficiency purposes. However, the key of this cache does not entirely reflect the SSL semantics of the desired SSL properties. This allows a client to request an SSL context and obtain one with weaker properties, such as a context with hostname validation that ignores hostname validation. The impacted component is io.vertx:vertx-core. Defenders should verify SSL context configuration for efficiency purposes and monitor for potential security risks associated with weaker SSL properties.

Defensive priority

High

Recommended defensive actions

• Review and update Eclipse Vert.x versions to 5.0.13 or later, 5.1.10 or later, or 5.2.1 or later
• Verify SSL context configuration for efficiency purposes
• Monitor for potential security risks associated with weaker SSL properties
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability 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 impacted component is io.vertx:vertx-core. Defenders should verify SSL context configuration for efficiency purposes and monitor for potential security risks associated with weaker SSL properties.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.