{"id":"CVE-2026-3960","state":"PUBLISHED","title":"Remote Code Execution in h2oai/h2o-3","description":"A critical remote code execution vulnerability exists in the unauthenticated REST API endpoint /99/ImportSQLTable in H2O-3 version 3.46.0.9 and prior. The vulnerability arises due to insufficient security controls in the parameter blacklist mechanism, which only targets MySQL JDBC driver-specific dangerous parameters. An attacker can bypass these controls by switching the JDBC URL protocol to jdbc:postgresql: and exploiting PostgreSQL JDBC driver-specific parameters such as socketFactory and socketFactoryArg. This allows unauthenticated attackers to execute arbitrary code on the H2O-3 server with the privileges of the H2O-3 process. The issue is resolved in version 3.46.0.10.","publishedAt":"2026-04-23T08:47:48.618Z","updatedAt":"2026-04-23T12:29:32.439Z","severity":{"score":5.9,"label":"Medium","version":"3.0","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"@huntr_ai"},"assigner":"@huntr_ai","products":["h2oai h2oai/h2o-3"],"affected":[{"vendor":"h2oai","product":"h2oai/h2o-3","versions":[{"version":"unspecified","status":"affected","lessThan":"3.46.0.10","versionType":"custom"}]}],"references":["https://huntr.com/bounties/6954fe04-b905-453f-8c53-205ac8377e0d","https://github.com/h2oai/h2o-3/commit/b9ae2d3c5220db2dc53753357a783e590364d044"],"weaknesses":["CWE-94"],"ingestedAt":"2026-10-29T20:11:50.837Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/3xxx/CVE-2026-3960.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-3960","state":"PUBLISHED","datePublished":"2026-04-23T08:47:48.618Z","dateUpdated":"2026-04-23T12:29:32.439Z","assignerShortName":"@huntr_ai","assignerOrgId":"c09c270a-b464-47c1-9133-acb35b22c19a","dateReserved":"2026-03-11T12:52:45.232Z"},"containers":{"cna":{"title":"Remote Code Execution in h2oai/h2o-3","descriptions":[{"lang":"en","value":"A critical remote code execution vulnerability exists in the unauthenticated REST API endpoint /99/ImportSQLTable in H2O-3 version 3.46.0.9 and prior. The vulnerability arises due to insufficient security controls in the parameter blacklist mechanism, which only targets MySQL JDBC driver-specific dangerous parameters. An attacker can bypass these controls by switching the JDBC URL protocol to jdbc:postgresql: and exploiting PostgreSQL JDBC driver-specific parameters such as socketFactory and socketFactoryArg. This allows unauthenticated attackers to execute arbitrary code on the H2O-3 server with the privileges of the H2O-3 process. The issue is resolved in version 3.46.0.10."}],"affected":[{"vendor":"h2oai","product":"h2oai/h2o-3","versions":[{"version":"unspecified","status":"affected","lessThan":"3.46.0.10","versionType":"custom"}]}],"references":[{"url":"https://huntr.com/bounties/6954fe04-b905-453f-8c53-205ac8377e0d"},{"url":"https://github.com/h2oai/h2o-3/commit/b9ae2d3c5220db2dc53753357a783e590364d044"}],"metrics":[{"cvssV3_0":{"version":"3.0","attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":5.9,"baseSeverity":"MEDIUM"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-94","type":"CWE","lang":"en","description":"CWE-94 Improper Control of Generation of Code"}]}],"providerMetadata":{"shortName":"@huntr_ai","orgId":"c09c270a-b464-47c1-9133-acb35b22c19a","dateUpdated":"2026-04-23T08:47:48.618Z"},"source":{"advisory":"6954fe04-b905-453f-8c53-205ac8377e0d","discovery":"EXTERNAL"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-23T12:25:29.022861Z","id":"CVE-2026-3960","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-04-23T12:29:32.439Z"}}]}}}