{"id":"CVE-2024-7765","aliases":["GHSA-6w62-3jvj-mfj6","PYSEC-2026-1439"],"title":"H2O Vulnerable to Denial of Service (DoS) via Large GZIP Parsing","summary":"H2O Vulnerable to Denial of Service (DoS) via Large GZIP Parsing","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 >= 3.32.1.2, <= 3.46.0.2","ai.h2o:h2o-core >= 3.32.1.2, <= 3.46.0.2"],"published":"2025-03-20","updated":"2026-07-07","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-6w62-3jvj-mfj6","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-7765"},{"url":"https://github.com/h2oai/h2o-3"},{"url":"https://github.com/h2oai/h2o-3/blob/7d418fa19d3ab434f742818e37f891bef9102c97/h2o-core/src/main/java/water/parser/ParseDataset.java#L900"},{"url":"https://huntr.com/bounties/0e58b1a5-bdca-4e60-af92-09de9c76a9ff"}],"tags":["osv","pip"],"epss":0.00763,"epssPercentile":0.53912,"ingestedAt":"2026-07-08T18:25:46.547Z","slug":"CVE-2024-7765","body":"## Overview\n\nIn h2oai/h2o-3 version 3.46.0.2, a vulnerability exists where uploading and repeatedly parsing a large GZIP file can cause a denial of service. The server becomes unresponsive due to memory exhaustion and a large number of concurrent slow-running jobs. This issue arises from the improper handling of highly compressed data, leading to significant data amplification.\n\n## Affected packages\n\n- `h2o >= 3.32.1.2, <= 3.46.0.2`\n- `ai.h2o:h2o-core >= 3.32.1.2, <= 3.46.0.2`\n\n## Remediation\n\nRefer to the advisory for the patched release.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}