{"id":"CVE-2024-10550","aliases":["GHSA-7qq7-pvm9-x8rf","PYSEC-2026-1440"],"title":"H2O Vulnerable to Denial of Service (DoS) via `/3/ParseSetup` Endpoint","summary":"H2O Vulnerable to Denial of Service (DoS) via `/3/ParseSetup` Endpoint","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","vendor":"h2o","product":"h2o","ecosystem":"pip","affected":["h2o >= 3.30.0.7, <= 3.46.0.1","ai.h2o:h2o-core >= 3.30.0.7, <= 3.46.0.1"],"published":"2025-03-20","updated":"2026-07-07","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-7qq7-pvm9-x8rf","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-10550"},{"url":"https://github.com/h2oai/h2o-3"},{"url":"https://github.com/h2oai/h2o-3/blob/51c25940ded8b7d0acc8f3f72329fd9dedbb3a34/h2o-core/src/main/java/water/api/ParseSetupHandler.java#L121"},{"url":"https://huntr.com/bounties/ef3f4d89-3b8b-4618-b134-cb93c1664ec6"}],"tags":["osv","pip"],"epss":0.00624,"epssPercentile":0.48256,"ingestedAt":"2026-07-08T18:25:47.169Z","slug":"CVE-2024-10550","body":"## Overview\n\nA 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.\n\n## Affected packages\n\n- `h2o >= 3.30.0.7, <= 3.46.0.1`\n- `ai.h2o:h2o-core >= 3.30.0.7, <= 3.46.0.1`\n\n## Remediation\n\nRefer to the advisory for the patched release.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}