{"api_version":"1","generated_at":"2026-04-23T12:53:30+00:00","cve":"CVE-2026-3960","urls":{"html":"https://cve.report/CVE-2026-3960","api":"https://cve.report/api/cve/CVE-2026-3960.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-3960","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-3960"},"summary":{"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.","state":"PUBLISHED","assigner":"@huntr_ai","published_at":"2026-04-23 10:16:17","updated_at":"2026-04-23 10:16:17"},"problem_types":["CWE-94","CWE-94 CWE-94 Improper Control of Generation of Code"],"metrics":[{"version":"3.0","source":"security@huntr.dev","type":"Secondary","score":"5.9","severity":"MEDIUM","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"version":"3.0","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","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.0","source":"CNA","type":"DECLARED","score":"5.9","severity":"MEDIUM","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":5.9,"baseSeverity":"MEDIUM","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","version":"3.0"}}],"references":[{"url":"https://github.com/h2oai/h2o-3/commit/b9ae2d3c5220db2dc53753357a783e590364d044","name":"https://github.com/h2oai/h2o-3/commit/b9ae2d3c5220db2dc53753357a783e590364d044","refsource":"security@huntr.dev","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://huntr.com/bounties/6954fe04-b905-453f-8c53-205ac8377e0d","name":"https://huntr.com/bounties/6954fe04-b905-453f-8c53-205ac8377e0d","refsource":"security@huntr.dev","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-3960","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3960","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"h2oai","product":"h2oai/h2o-3","version":"affected unspecified 3.46.0.10 custom","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"product":"h2oai/h2o-3","vendor":"h2oai","versions":[{"lessThan":"3.46.0.10","status":"affected","version":"unspecified","versionType":"custom"}]}],"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."}],"metrics":[{"cvssV3_0":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":5.9,"baseSeverity":"MEDIUM","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","version":"3.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-94","description":"CWE-94 Improper Control of Generation of Code","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-04-23T08:47:48.618Z","orgId":"c09c270a-b464-47c1-9133-acb35b22c19a","shortName":"@huntr_ai"},"references":[{"url":"https://huntr.com/bounties/6954fe04-b905-453f-8c53-205ac8377e0d"},{"url":"https://github.com/h2oai/h2o-3/commit/b9ae2d3c5220db2dc53753357a783e590364d044"}],"source":{"advisory":"6954fe04-b905-453f-8c53-205ac8377e0d","discovery":"EXTERNAL"},"title":"Remote Code Execution in h2oai/h2o-3"}},"cveMetadata":{"assignerOrgId":"c09c270a-b464-47c1-9133-acb35b22c19a","assignerShortName":"@huntr_ai","cveId":"CVE-2026-3960","datePublished":"2026-04-23T08:47:48.618Z","dateReserved":"2026-03-11T12:52:45.232Z","dateUpdated":"2026-04-23T08:47:48.618Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-04-23 10:16:17","lastModifiedDate":"2026-04-23 10:16:17","problem_types":["CWE-94","CWE-94 CWE-94 Improper Control of Generation of Code"],"metrics":{"cvssMetricV30":[{"source":"security@huntr.dev","type":"Secondary","cvssData":{"version":"3.0","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","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":2.2,"impactScore":3.6}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"3960","Ordinal":"1","Title":"Remote Code Execution in h2oai/h2o-3","CVE":"CVE-2026-3960","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"3960","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"Remote Code Execution in h2oai/h2o-3"}]}}}