{"action":"Upgrade h3 to 1.15.9 or later.","affected":[{"fixed":"1.15.9","introduced":"0"}],"component":"h3","cve_ids":["CVE-2026-86251"],"ecosystem":"npm","epss":0.00428,"exploited":false,"fixed_versions":["1.15.9"],"ghsa_id":"GHSA-72gr-qfp7-vwhw","id":"tcs_01M5KF8FJAEY3QKT8344PDJW32","modified_at":"2026-09-10T03:50:37.806165140Z","published_at":"2026-03-20T20:50:09Z","references":["https://osv.dev/vulnerability/GHSA-72gr-qfp7-vwhw","https://github.com/h3js/h3/security/advisories/GHSA-72gr-qfp7-vwhw","https://github.com/h3js/h3"],"severity":{"label":"medium","score":5.9},"sources":[{"source":"osv","source_id":"GHSA-72gr-qfp7-vwhw","url":"https://osv.dev/vulnerability/GHSA-72gr-qfp7-vwhw"}],"summary":"h3: Double Decoding in `serveStatic` Bypasses `resolveDotSegments` Path Traversal Protection via `%252e%252e`"}