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CVE-2026-102466

8.2 high SSVC exploitation: none Analyzed
NVD · CVE.org

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 Vert.x MySQL client (vertx-mysql-client) pre-allocates an array for column definitions based on a server-declared column count with no upper-bound validation. A malicious or compromised MySQL server, or an attacker with man-in-the-middle positioning, can send a crafted result set packet with an extremely large column count, causing the client to attempt a massive heap allocation. The resulting OutOfMemoryError crashes the Netty event loop thread, causing a complete denial of service for all connections and verticles in the Vert.x application. The impacted component is io.vertx:vertx-mysql-client.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 6

  1. Cpes+2 CPE criteria (now 2)NVD modified 2026-10-20 19:28
  2. StatusUndergoing Analysis → AnalyzedNVD modified 2026-10-20 19:28
  3. CwesCWE-789NVD modified 2026-10-15 15:17
  4. StatusAwaiting Analysis → Undergoing AnalysisNVD modified 2026-10-15 15:17
  5. StatusReceived → Awaiting AnalysisNVD modified 2026-10-15 14:41
  6. First seenCVSS 8.2NVD modified 2026-10-15 09:17

Affected (CPE criteria) 2

  • cpe:2.3:a:eclipse:vert.x:*:*:*:*:*:*:*:*
  • cpe:2.3:a:eclipse:vert.x:5.2.0:*:*:*:*:*:*:*

References 2