{"id":"GHSA-5w3j-gwgh-4rfv","summary":"H2O affected by a deserialization vulnerability","details":"A deserialization vulnerability exists in h2oai/h2o-3 versions \u003c= 3.46.0.7, allowing attackers to read arbitrary system files and execute arbitrary code. The vulnerability arises from improper handling of JDBC connection parameters, which can be exploited by bypassing regular expression checks and using double URL encoding. This issue impacts all users of the affected versions.","aliases":["CVE-2025-6544","PYSEC-2026-349"],"modified":"2026-06-29T12:26:32.691823215Z","published":"2025-09-22T18:30:34Z","database_specific":{"github_reviewed_at":"2025-09-22T21:09:54Z","nvd_published_at":"2025-09-21T09:15:38Z","cwe_ids":["CWE-502"],"severity":"CRITICAL","github_reviewed":true},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-6544"},{"type":"WEB","url":"https://github.com/h2oai/h2o-3/commit/0298ee348f5c73673b7b542158081e79605f5f25"},{"type":"PACKAGE","url":"https://github.com/h2oai/h2o-3"},{"type":"WEB","url":"https://huntr.com/bounties/53f35a0f-d644-4f82-93aa-89fe7e0aed40"}],"affected":[{"package":{"name":"ai.h2o:h2o-core","ecosystem":"Maven","purl":"pkg:maven/ai.h2o/h2o-core"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"3.46.0.7"}]}],"versions":["0.1.10","0.1.11","0.1.12","0.1.13","0.1.14","0.1.15","0.1.16","0.1.17","0.1.18","0.1.19","0.1.20","0.1.21","0.1.22","0.1.23","0.1.24","0.1.25","0.1.3","0.1.3.1","0.1.4","0.1.5","0.1.6","0.1.8","0.1.9","0.2.3.5","0.2.3.6","0.3.0.2","3.0.0.12","3.0.0.16","3.0.0.18","3.0.0.19","3.0.0.22","3.0.0.25","3.0.0.26","3.0.0.30","3.0.0.5","3.0.0.8","3.0.1.2","3.0.1.3","3.0.1.4","3.10.0.1","3.10.0.10","3.10.0.2","3.10.0.3","3.10.0.4","3.10.0.5","3.10.0.6","3.10.0.7","3.10.0.8","3.10.0.9","3.10.1.1","3.10.1.2","3.10.2.1","3.10.2.2","3.10.3.1","3.10.3.2","3.10.3.3","3.10.3.4","3.10.3.5","3.10.3.6","3.10.4.1","3.10.4.11","3.10.4.12","3.10.4.2","3.10.4.3","3.10.4.4","3.10.4.5","3.10.4.6","3.10.4.7","3.10.4.8","3.10.4.9","3.10.5.1","3.10.5.2","3.10.5.3","3.10.5.4","3.12.0.1","3.14.0.1","3.14.0.2","3.14.0.3","3.14.0.4","3.14.0.5","3.14.0.6","3.14.0.7","3.16.0.1","3.16.0.10","3.16.0.11","3.16.0.12","3.16.0.2","3.16.0.3","3.16.0.4","3.16.0.5","3.16.0.6","3.16.0.7","3.16.0.8","3.16.0.9","3.18.0.1","3.18.0.10","3.18.0.11","3.18.0.2","3.18.0.3","3.18.0.4","3.18.0.5","3.18.0.6","3.18.0.7","3.18.0.8","3.18.0.9","3.2.0.1","3.2.0.2","3.2.0.3","3.2.0.4","3.2.0.5","3.2.0.6","3.2.0.7","3.2.0.8","3.2.0.9","3.20.0.1","3.20.0.10","3.20.0.2","3.20.0.3","3.20.0.4","3.20.0.5","3.20.0.6","3.20.0.7","3.20.0.8","3.20.0.9","3.22.0.1","3.22.0.2","3.22.0.3","3.22.0.4","3.22.0.5","3.22.1.1","3.22.1.2","3.22.1.3","3.22.1.4","3.22.1.5","3.22.1.6","3.24.0.1","3.24.0.2","3.24.0.3","3.24.0.4","3.24.0.5","3.26.0.1","3.26.0.10","3.26.0.11","3.26.0.2","3.26.0.3","3.26.0.4","3.26.0.5","3.26.0.6","3.26.0.8","3.26.0.9","3.28.0.1","3.28.0.2","3.28.0.3","3.28.0.4","3.28.1.1","3.28.1.2","3.28.1.3","3.30.0.1","3.30.0.2","3.30.0.3","3.30.0.4","3.30.0.5","3.30.0.6","3.30.0.7","3.30.1.1","3.30.1.2","3.30.1.3","3.32.0.1","3.32.0.2","3.32.0.3","3.32.0.4","3.32.0.5","3.32.1.1","3.32.1.2","3.32.1.3","3.32.1.4","3.32.1.5","3.32.1.6","3.32.1.7","3.34.0.1","3.34.0.3","3.34.0.4","3.34.0.5","3.34.0.6","3.34.0.7","3.34.0.8","3.35.0.2","3.36.0.1","3.36.0.2","3.36.0.3","3.36.0.4","3.36.1.1","3.36.1.2","3.36.1.3","3.36.1.4","3.36.1.5","3.38.0.1","3.38.0.2","3.38.0.3","3.38.0.4","3.4.0.1","3.40.0.1","3.40.0.2","3.40.0.3","3.40.0.4","3.42.0.1","3.42.0.2","3.42.0.3","3.42.0.4","3.44.0.1","3.44.0.2","3.44.0.3","3.46.0.1","3.46.0.2","3.46.0.3","3.46.0.4","3.46.0.5","3.46.0.6","3.46.0.7","3.6.0.1","3.6.0.10","3.6.0.11","3.6.0.12","3.6.0.2","3.6.0.3","3.6.0.4","3.6.0.5","3.6.0.7","3.6.0.8","3.8.0.1","3.8.0.2","3.8.0.3","3.8.0.4","3.8.0.5","3.8.0.6","3.8.1.1","3.8.1.2","3.8.1.3","3.8.1.4","3.8.2.1","3.8.2.11","3.8.2.2","3.8.2.3","3.8.2.4","3.8.2.5","3.8.2.6","3.8.2.7","3.8.2.8","3.8.2.9","3.8.3.1","3.8.3.2","3.8.3.3","3.8.3.4"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/09/GHSA-5w3j-gwgh-4rfv/GHSA-5w3j-gwgh-4rfv.json"}},{"package":{"name":"h2o","ecosystem":"PyPI","purl":"pkg:pypi/h2o"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"3.46.0.7"}]}],"versions":["3.10.0.10","3.10.0.3","3.10.0.6","3.10.0.7","3.10.0.8","3.10.3.3","3.10.3.4","3.10.4.1","3.10.4.2","3.10.4.3","3.10.4.4","3.10.4.6","3.10.4.8","3.16.0.1","3.16.0.2","3.16.0.3","3.16.0.4","3.18.0.1","3.18.0.10","3.18.0.11","3.18.0.2","3.18.0.3","3.18.0.4","3.18.0.5","3.18.0.6","3.18.0.7","3.18.0.8","3.18.0.9","3.20.0.4","3.20.0.5","3.20.0.6","3.20.0.7","3.20.0.8","3.22.0.1","3.22.0.2","3.22.0.3","3.22.0.4","3.22.0.5","3.22.1.1","3.22.1.2","3.22.1.3","3.22.1.4","3.22.1.5","3.22.1.6","3.24.0.1","3.24.0.2","3.24.0.3","3.24.0.4","3.24.0.5","3.26.0.1","3.26.0.10","3.26.0.11","3.26.0.2","3.26.0.3","3.26.0.4","3.26.0.5","3.26.0.6","3.26.0.8","3.26.0.9","3.28.0.1","3.28.0.2","3.28.0.3","3.28.1.2","3.28.1.3","3.30.0.1","3.30.0.2","3.30.0.3","3.30.0.4","3.30.0.5","3.30.0.6","3.30.0.7","3.30.1.1","3.30.1.2","3.30.1.3","3.32.0.2","3.32.0.3","3.32.0.4","3.32.0.5","3.32.1.1","3.32.1.2","3.32.1.3","3.32.1.4","3.32.1.5","3.32.1.6","3.32.1.7","3.34.0.3","3.34.0.7","3.34.0.8","3.36.0.2","3.36.0.3","3.36.0.4","3.36.1.1","3.36.1.2","3.36.1.3","3.36.1.4","3.36.1.5","3.38.0.1","3.38.0.2","3.38.0.3","3.38.0.4","3.40.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