{"identifier":"CVE-2026-102469","cve":{"id":"CVE-2026-102469","description":"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.\n\n\n\nThis 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.\n\n\n\nNevertheless, 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.\n\n\n\nThe impacted component is io.vertx:vertx-db2-client.","published":"2026-10-15T09:17:15.573000+00:00","modified":"2026-10-20T19:27:39.213000+00:00","status":"Analyzed","score":9.2,"severity":"CRITICAL","vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_version":"4.0","affected":[{"criteria":"cpe:2.3:a:eclipse:vert.x:*:*:*:*:*:*:*:*","versionStartIncluding":"4.5.0","versionStartExcluding":"","versionEndIncluding":"","versionEndExcluding":"4.5.35"},{"criteria":"cpe:2.3:a:eclipse:vert.x:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0.0","versionStartExcluding":"","versionEndIncluding":"","versionEndExcluding":"5.1.10"},{"criteria":"cpe:2.3:a:eclipse:vert.x:5.2.0:*:*:*:*:*:*:*","versionStartIncluding":"","versionStartExcluding":"","versionEndIncluding":"","versionEndExcluding":""}],"weaknesses":["CWE-502"],"references":[{"url":"https://github.com/eclipse-vertx/vertx-sql-client/security/advisories/GHSA-j4vf-w939-pgxf","source":"emo@eclipse.org","tags":["Vendor Advisory"]},{"url":"https://gitlab.eclipse.org/security/cve-assignment/-/work_items/347","source":"emo@eclipse.org","tags":["Issue Tracking","Third Party Advisory"]}],"kev":null,"kev_checked":true,"metrics":{"cvssMetricV40":[{"source":"emo@eclipse.org","type":"Secondary","cvssData":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","baseScore":9.2,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"HIGH","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}}],"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":5.9,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":2.2,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-10-15T14:28:32.965961Z","id":"CVE-2026-102469","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:eclipse:vert.x:*:*:*:*:*:*:*:*","versionStartIncluding":"4.5.0","versionEndExcluding":"4.5.35","matchCriteriaId":"34023A21-83CE-4F83-AE87-0013BAB3835E"},{"vulnerable":true,"criteria":"cpe:2.3:a:eclipse:vert.x:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0.0","versionEndExcluding":"5.1.10","matchCriteriaId":"12790AEA-EB50-47A2-8B07-1D7A7016E0D3"},{"vulnerable":true,"criteria":"cpe:2.3:a:eclipse:vert.x:5.2.0:*:*:*:*:*:*:*","matchCriteriaId":"50BC34C1-4AB6-4047-A3D3-0201A78D81E3"}]}]}],"source":"nvd","retrieved_at":"2026-10-28T10:22:36.715881+00:00","exploited":false,"kev_stale":false,"products":["eclipse / vert.x"],"priority":{"label":"Critical technical severity","reasons":["CVSS is at least 9.0; 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