{"id":"CVE-2024-10549","aliases":["GHSA-wwr9-4gmr-xvq9","PYSEC-2026-1445"],"title":"H2O Vulnerable to Denial of Service (DoS) via `/3/Parse` Endpoint","summary":"H2O Vulnerable to Denial of Service (DoS) via `/3/Parse` 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-wwr9-4gmr-xvq9","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-10549"},{"url":"https://github.com/h2oai/h2o-3"},{"url":"https://github.com/h2oai/h2o-3/blob/51c25940ded8b7d0acc8f3f72329fd9dedbb3a34/h2o-core/src/main/java/water/api/ParseHandler.java#L80"},{"url":"https://huntr.com/bounties/ce7bd2d6-fd38-440d-a91a-dd8f3fc06bc2"}],"tags":["osv","pip"],"epss":0.00624,"epssPercentile":0.48601,"ingestedAt":"2026-07-08T18:25:53.922Z","slug":"CVE-2024-10549","body":"## Overview\n\nA vulnerability in the `/3/Parse` endpoint of h2oai/h2o-3 version 3.46.0.1 allows for a denial of service (DoS) attack. The endpoint uses a user-specified string to construct a regular expression, which is then applied to another user-specified string. By sending multiple simultaneous requests, an attacker can exhaust all available threads, leading to a complete denial of service.\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":[]}