{"id":"PYSEC-2026-1440","summary":"H2O Vulnerable to Denial of Service (DoS) via `/3/ParseSetup` Endpoint","details":"A vulnerability in the `/3/ParseSetup` endpoint of h2oai/h2o-3 version 3.46.0.1 allows for a denial of service (DoS) attack. The endpoint applies a user-specified regular expression to a user-controllable string. This can be exploited by an attacker to cause inefficient regular expression complexity, leading to the exhaustion of server resources and making the server unresponsive.","aliases":["CVE-2024-10550","GHSA-7qq7-pvm9-x8rf"],"modified":"2026-07-07T17:46:12.545332105Z","published":"2026-07-07T14:34:51.391868Z","references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-10550"},{"type":"PACKAGE","url":"https://github.com/h2oai/h2o-3"},{"type":"WEB","url":"https://github.com/h2oai/h2o-3/blob/51c25940ded8b7d0acc8f3f72329fd9dedbb3a34/h2o-core/src/main/java/water/api/ParseSetupHandler.java#L121"},{"type":"WEB","url":"https://huntr.com/bounties/ef3f4d89-3b8b-4618-b134-cb93c1664ec6"},{"type":"PACKAGE","url":"https://pypi.org/project/h2o"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-7qq7-pvm9-x8rf"}],"affected":[{"package":{"name":"h2o","ecosystem":"PyPI","purl":"pkg:pypi/h2o"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.30.0.7"},{"last_affected":"3.46.0.1"}]}],"versions":["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","3.40.0.1","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"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/h2o/PYSEC-2026-1440.yaml"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}