{"action":"No fix published. Pin and monitor.","affected":[{"introduced":"0","last_affected":"3.46.0.7"}],"component":"h2o","cve_ids":["CVE-2025-6544"],"ecosystem":"PyPI","epss":0.00919,"exploited":false,"fixed_versions":[],"ghsa_id":"GHSA-5w3j-gwgh-4rfv","id":"tcs_01M5KF1TYTW933R2AFXFGQHHHZ","modified_at":"2026-06-29T12:26:32.691823215Z","published_at":"2025-09-22T18:30:34Z","references":["https://osv.dev/vulnerability/GHSA-5w3j-gwgh-4rfv","https://nvd.nist.gov/vuln/detail/CVE-2025-6544","https://github.com/h2oai/h2o-3/commit/0298ee348f5c73673b7b542158081e79605f5f25","https://github.com/h2oai/h2o-3","https://huntr.com/bounties/53f35a0f-d644-4f82-93aa-89fe7e0aed40"],"severity":{"label":"critical","score":9.8},"sources":[{"source":"osv","source_id":"GHSA-5w3j-gwgh-4rfv","url":"https://osv.dev/vulnerability/GHSA-5w3j-gwgh-4rfv"}],"summary":"H2O affected by a deserialization vulnerability"}