{"cve":"CVE-2026-3960","nvd":{"published":"2026-04-23T10:16:17.813","modified":"2026-10-26T22:10:00.163","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-94"],"references":["https://github.com/h2oai/h2o-3/commit/b9ae2d3c5220db2dc53753357a783e590364d044","https://huntr.com/bounties/6954fe04-b905-453f-8c53-205ac8377e0d"],"products":["h2o:h2o"],"source":"nvd","synced_at":"2026-10-26T22:26:44.656832877+00:00"},"epss":{"cve":"CVE-2026-3960","score":0.00938,"percentile":0.60628,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-qmcv-hh7c-3m56","url":"https://osv.dev/vulnerability/GHSA-qmcv-hh7c-3m56","summary":"H2O-3 is Vulnerable to Code Injection","modified":"2026-07-13T07:26:29.642873751Z","packages":[{"ecosystem":"Maven","name":"ai.h2o:h2o-core","purl":"pkg:maven/ai.h2o/h2o-core","ranges":["<3.46.0.10"],"fixed":["3.46.0.10"]}]},{"id":"PYSEC-2026-2180","url":"https://osv.dev/vulnerability/PYSEC-2026-2180","summary":"","modified":"2026-07-13T07:26:29.642873751Z","packages":[{"ecosystem":"PyPI","name":"h2o","purl":"pkg:pypi/h2o","ranges":["<3.46.0.10"],"fixed":["3.46.0.10"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}