CVE-2026-102465 Eclipse Foundation CVE debrief

Who should care

Defenders responsible for Eclipse Vert.x deployments should assess exposure and prioritize verification and remediation efforts. They should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance, and plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Why it matters

Defenders should prioritize verification of affected Eclipse Vert.x versions and apply patches or mitigations as available to prevent potential denial of service and OutOfMemoryError crashes.

• Potential denial of service to all connections and verticles sharing the event loop thread
• Possible OutOfMemoryError crashes of the Vert.x event loop thread

Technical summary

Eclipse Vert.x versions [4.0.0, 4.5.34] or [5.0.0,5.0.12] or [5.1.0,5.1.9] or [5.2.0, 5.2.0] are vulnerable to a potential OutOfMemoryError due to a malicious or compromised Redis server, or an attacker in a man-in-the-middle position, sending a crafted RESP response declaring an extremely large array, push, or attribute length. The resulting OutOfMemoryError crashes the Vert.x event loop thread, denying service to all connections and verticles sharing that loop. The impacted component is io.vertx:vertx-mysql-client.

Defensive priority

Defenders should prioritize verification of affected Eclipse Vert.x versions and apply patches or mitigations as available.

Recommended defensive actions

• Verify Eclipse Vert.x version and apply patches or mitigations as available
• Review and update inventory of affected systems
• Monitor for potential exploitation attempts
• 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 source item provide details on the vulnerability in Eclipse Vert.x, including affected versions and references to vendor advisories. The vulnerability allows a malicious or compromised Redis server, or an attacker in a man-in-the-middle position, to send a crafted RESP response that can cause the client to attempt a massive heap allocation. Defenders should verify the affected Eclipse Vert.x versions and apply patches or mitigations as available.

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.