CVE-2026-102463 Eclipse Foundation CVE debrief

Who should care

Defenders responsible for Eclipse Vert.x deployments, especially those using the vertx-pg-client component, should assess exposure and prioritize patching. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify affected versions and deployments, review vendor guidance, and implement compensating controls. Security teams should also monitor for suspicious PostgreSQL server traffic and review  

Why it matters

CVE-2026-102463 is a high-severity vulnerability in Eclipse Vert.x vertx-pg-client that can cause a client to crash with an OutOfMemoryError, potentially leading to denial-of-service (DoS) attacks and data breaches.

• Potential for denial-of-service (DoS) attacks
• Need for verification of affected versions and deployments
• Priority for patching and updating vertx-pg-client
• Potential for data breaches or system compromise if exploited

Technical summary

The binary array decoder in vertx-pg-client allocates a Java array sized by a server-declared 32-bit dimension count with no upper bound, allowing a malicious server or on-path attacker to cause a client crash with an OutOfMemoryError. This vulnerability can be exploited by sending a crafted DataRow message with an excessively large array dimension value. The impacted component is io.vertx:vertx-pg-client, and defenders should prioritize verifying and patching affected Eclipse Vert.x deployments, especially those using the vertx-pg-client component.

Defensive priority

Defenders should prioritize verifying and patching affected Eclipse Vert.x deployments, especially those using the vertx-pg-client component.

Recommended defensive actions

• Verify and patch affected Eclipse Vert.x deployments using vertx-pg-client
• Monitor for and restrict suspicious PostgreSQL server traffic
• Implement compensating controls, such as encryption and access controls
• Review and update incident response plans to address potential DoS attacks
• Conduct vulnerability assessments to identify exposed assets
• Prioritize patching and updating vertx-pg-client
• Track and verify remediation progress through testing and validation

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but additional information on affected versions and remediation steps is limited. Defenders should verify affected versions and deployments, review vendor guidance, and monitor for suspicious PostgreSQL server traffic. The Eclipse Vert.x community and users of vertx-pg-client should take immediate action to assess exposure and apply patches or mitigations as recommended by the vendor.

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.