{"id":"CVE-2026-3960","aliases":["GHSA-qmcv-hh7c-3m56","PYSEC-2026-2180"],"url":"https://o3.security/vulnerability/CVE-2026-3960","summary":"Remote Code Execution in h2oai/h2o-3","details":"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.","published":"2026-04-23T08:47:48.618Z","modified":"2026-07-15T23:33:37.482606Z","cvss":{"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"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"ai.h2o:h2o-core","fixedVersion":"3.46.0.10"}],"fix":{"url":"https://github.com/h2oai/h2o-3/commit/b9ae2d3c5220db2dc53753357a783e590364d044","label":"h2oai/h2o-3@b9ae2d3"},"references":[{"type":"WEB","url":"https://huntr.com/bounties/6954fe04-b905-453f-8c53-205ac8377e0d"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3960.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3960"},{"type":"FIX","url":"https://github.com/h2oai/h2o-3/commit/b9ae2d3c5220db2dc53753357a783e590364d044"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T23:33:37.482606Z"}}