Is CVE-2026-102463 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-102463 being exploited in the wild.

How severe is CVE-2026-102463?

Medium severity, with a CVSS score of 5.9, published 15 October 2026.

Which products and versions are affected?

Eclipse Foundation Vert.x PostgreSQL Client 4.0.0 through 4.5.34, 5.0.0 through 5.0.12, 5.1.0 through 5.1.9, 5.2.0.

Is there a fix for CVE-2026-102463?

Yes: fixed in 4.5.35, 5.1.10, 5.2.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-102463 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-102463?

Check whether you run Eclipse Vert.X or Eclipse Foundation Vert.x PostgreSQL Client at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-102463: Eclipse Vert.x PostgreSQL client unbounded array allocation denial of service

CVE-2026-102463 · Severity: medium · CVSS 5.9 · Published 2026-10-15

Eclipse Vert.x's PostgreSQL client library handles database connections for Java applications. A malicious or compromised PostgreSQL server can send a specially crafted message that causes the client to attempt an enormous memory allocation, crashing the application. An attacker with network access to an unencrypted database connection can trigger a denial of service without authentication.

Technologies: Eclipse Vert.X. Vendors: Eclipse, Eclipse Foundation.

Quick answers

Is CVE-2026-102463 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-102463 being exploited in the wild.
How severe is CVE-2026-102463?: Medium severity, with a CVSS score of 5.9, published 15 October 2026.
Which products and versions are affected?: Eclipse Foundation Vert.x PostgreSQL Client 4.0.0 through 4.5.34, 5.0.0 through 5.0.12, 5.1.0 through 5.1.9, 5.2.0.
Is there a fix for CVE-2026-102463?: Yes: fixed in 4.5.35, 5.1.10, 5.2.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-102463 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-102463?: Check whether you run Eclipse Vert.X or Eclipse Foundation Vert.x PostgreSQL Client at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 4.5.35, 5.1.10, 5.2.1

Technical details

The binary array decoder in vertx-pg-client (DataTypeCodec.binaryDecodeArray) accepts a 32-bit dimension count from the server without validation or bounds-checking, leading to unbounded array allocation. A network attacker (malicious database server or on-path interceptor on an unencrypted connection) can send a crafted DataRow message with an excessively large dimension value, causing the client to attempt a multi-gigabyte heap allocation and crash with OutOfMemoryError.

Affected products

Eclipse Foundation Vert.x PostgreSQL Client 4.0.0 through 4.5.34, 5.0.0 through 5.0.12, 5.1.0 through 5.1.9, 5.2.0

Timeline

2026-10-07: disclosed: GitHub security advisory published
2026-10-15: advisory: CVE-2026-102463 published on NVD

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.