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CVE-2026-102469

Type: advisorySource: Official CVE List1 source record

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 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. This code path is triggered when a DRDA server sends a result set with a column tagged as UDT (FDOCA protocol LID 0x50). However, DB2 does not support this type of UDT. The FDOCA 0x50 type is never sent by a legitimate DB2 server. Nevertheless, 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. If a Java deserialization gadget chain is present on the application's classpath, this enables remote code execution. Without a gadget chain, denial of service is possible via crafted object graphs. TLS is disabled by default, making man-in-the-middle exploitation feasible. The impacted component is io.vertx:vertx-db2-client.

Announced Source revision 1
Original source ↗

CVE-2026-102469

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-102469

Eclipse Vert.x

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "Eclipse Foundation",
    "product": "Eclipse Vert.x",
    "versions": [
      {
        "status": "affected",
        "version": "4.0.0",
        "versionType": "semver",
        "lessThanOrEqual": "4.5.34"
      },
      {
        "status": "affected",
        "version": "5.0.0",
        "versionType": "semver",
        "lessThanOrEqual": "5.0.12"
      },
      {
        "status": "affected",
        "version": "5.1.0",
        "versionType": "semver",
        "lessThanOrEqual": "5.1.9"
      },
      {
        "status": "affected",
        "version": "5.2.0",
        "versionType": "semver"
      }
    ],
    "defaultStatus": "unaffected"
  }
]
Related CVEs
CVE-2026-102469

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#28805 · Revision 1
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Publisher date
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