{"id":"CVE-2024-8062","aliases":["GHSA-5c8j-g96x-cj78","PYSEC-2026-1438"],"title":"H2O Vulnerable to Denial of Service (DoS) via `HEAD` Request","summary":"H2O Vulnerable to Denial of Service (DoS) via `HEAD` Request","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 >= 3.2.0.1, <= 3.46.0","ai.h2o:h2o-core >= 3.2.0.1, <= 3.46.0"],"published":"2025-03-20","updated":"2026-07-07","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-5c8j-g96x-cj78","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-8062"},{"url":"https://github.com/h2oai/h2o-3"},{"url":"https://github.com/h2oai/h2o-3/blob/047a4d617240a56e74f834207c65973d133391cb/h2o-core/src/main/java/water/persist/PersistManager.java#L302"},{"url":"https://huntr.com/bounties/a04190d9-4acb-449a-9a7f-f1bf6be1ed23"}],"tags":["osv","pip"],"epss":0.00473,"epssPercentile":0.39956,"ingestedAt":"2026-07-08T18:25:45.957Z","slug":"CVE-2024-8062","body":"## Overview\n\nA vulnerability in the typeahead endpoint of h2oai/h2o-3 version 3.46.0 allows for a denial of service. The endpoint performs a `HEAD` request to verify the existence of a specified resource without setting a timeout. An attacker can exploit this by sending multiple requests to an attacker-controlled server that hangs, causing the application to block and become unresponsive to other requests.\n\n## Affected packages\n\n- `h2o >= 3.2.0.1, <= 3.46.0`\n- `ai.h2o:h2o-core >= 3.2.0.1, <= 3.46.0`\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":[]}