{"id":"CVE-2026-86253","summary":"h3 before 1.15.6 Path Traversal via Percent-Encoded Dot Segments","details":"h3 (npm package) versions \u003c= 2.0.1-rc.14 contain a path traversal vulnerability in serveStatic(). On Node.js deployments, event.url.pathname is not normalized, so percent-encoded dot segments (%2e%2e) are passed to decodeURI() and decoded to ../ sequences without sanitization. An unauthenticated remote attacker can send crafted requests to endpoints served by serveStatic() to read arbitrary files outside the intended static directory. Fixed in 1.15.6 and 2.0.1-rc.15.","aliases":["GHSA-wr4h-v87w-p3r7"],"modified":"2026-09-12T03:31:01.522148932Z","published":"2026-09-06T12:00:28.232Z","database_specific":{"cwe_ids":["CWE-22"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86253.json","cna_assigner":"VulnCheck"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86253.json"},{"type":"ADVISORY","url":"https://github.com/h3js/h3/security/advisories/GHSA-wr4h-v87w-p3r7"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86253"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/h3-before-1.15.6-path-traversal-via-percent-encoded-dot-segments"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/h3js/h3","events":[{"introduced":"0"},{"fixed":"829daf157e5add61d60fb18dfdd9f6885e57a5e3"},{"introduced":"8120545c3ce65f0149f59d72d4db7cb1a53b83e3"},{"fixed":"91361835657410605f2041762da9e3f60d24ecfb"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.15.6"},{"introduced":"2.0.0-beta.0"},{"fixed":"2.0.1-rc.15"}],"source":"AFFECTED_FIELD"}}],"versions":["v1.15.5","v2.0.1-rc.14","v2.0.1-rc.13","v2.0.1-rc.12","v2.0.1-rc.11","v2.0.1-rc.10","v2.0.1-rc.9","v2.0.1-rc.8","v2.0.1-rc.7","v2.0.1-rc.6","v2.0.1-rc.5","v2.0.1-rc.4","v2.0.1-rc.3","v2.0.1-rc.2","v2.0.0-rc.1","v2.0.0-beta.5","v1.15.4","v2.0.0-beta.4","v2.0.0-beta.3","v2.0.0-beta.2","v2.0.0-beta.1","v2.0.0-beta.0","v1.15.2","v1.15.1","v1.15.0","v1.14.0","v1.13.1","v1.13.0","v1.12.0","v1.11.1","v1.11.0","v1.10.2","v1.10.1","v1.10.0","v1.9.0","v1.8.2","v1.8.1","v1.8.0","v1.8.0-rc.3","v1.8.0-rc.2","v1.8.0-rc.1","v1.8.0-rc.0","v1.7.1","v1.7.0","v1.6.6","v1.6.5","v1.6.4","v1.6.3","v1.6.2","v1.6.1","v1.6.0","v1.5.0","v1.4.0","v1.3.0","v1.2.1","v1.2.0","v1.1.0","v1.0.2","v1.0.1","v1.0.0","v0.8.6","v0.8.5","v0.8.4","v0.8.3","v0.8.2","v0.8.1","v0.8.0","v0.7.21","v0.7.20","v0.7.19","v0.7.18","v0.7.17","v0.7.16","v0.7.15","v0.7.14","v0.7.13","v0.7.12","v0.7.11","v0.7.10","v0.7.9","v0.7.8","v0.7.7","v0.7.6","v0.7.5","v0.7.4","v0.7.3","v0.7.2","v0.7.1","v0.7.0","v0.6.0","v0.5.7","v0.5.6","v0.5.5","v0.5.4","v0.5.3","v0.5.2","v0.5.1","v0.5.0","v0.4.2","v0.4.1","v0.4.0","v0.3.9","v0.3.8","v0.3.7","v0.3.6","v0.3.5","v0.3.4","v0.3.3","v0.3.2","v0.3.1","v0.3.0","v0.2.12","v0.2.11","v0.2.10","v0.2.9","v0.2.8","v0.2.7","v0.2.6","v0.2.5","v0.2.4","v0.2.3","v0.2.2","v0.2.1","v0.2.0","v0.0.15","v0.0.14","v0.0.13","v0.0.12","v0.0.11","v0.0.10","v0.0.9","v0.0.8","v0.0.7","v0.0.6","v0.0.5","v0.0.4","v0.0.3","v0.0.2","v0.0.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-86253.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"}]}