CVE-2026-102469 Eclipse Foundation CVE debrief

Who should care

Defenders and developers using Eclipse Vert.x DB2 client should assess exposure and prioritize remediation due to the potential for remote code execution or denial of service. This includes operators, platform administrators, vulnerability management teams, and security teams who need to review and update affected systems

Why it matters

CVE-2026-102469 is a critical vulnerability in the Eclipse Vert.x DB2 client that could lead to remote code execution or denial of service. Defenders and developers should assess exposure and prioritize remediation.

• Remote code execution is possible if a Java deserialization gadget chain is present on the application's classpath.
• Denial of service is possible via crafted object graphs.
• Man-in-the-middle exploitation is feasible due to TLS being disabled by default.
• Verification of affected versions and remediation is necessary.

Technical summary

The Vert.x DB2 client (vertx-db2-client) contains DRDA protocol handling code that deserializes User Defined Type (UDT) column data using a bare ObjectInputStream.readObject() call with no ObjectInputFilter or class allowlist. A malicious or man-in-the-middle DRDA server could craft a response with a 0x50-tagged column, causing the client to deserialize arbitrary attacker-controlled bytes on the Vert.x event loop before any application code can inspect or reject the data.

Defensive priority

High

Recommended defensive actions

• Review and update Eclipse Vert.x versions to the latest patched version
• Implement additional security measures to detect and prevent potential attacks
• Monitor systems for suspicious activity
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The vulnerability exists in the Vert.x DB2 client (vertx-db2-client) in 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]. The impacted component is io.vertx:vertx-db2-client. This information is based on the official CVE Program record and the NIST National Vulnerability Database.

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.