MEDIUMVulnerability
CVE-2026-86253
h3 (npm package) versions <= 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.
Properties
- severity
- MEDIUM
- score
- 5.9
- cve_id
- CVE-2026-86253
- signal_observed_at
- 2026-09-16T21:37:07+00:00
- vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- published_at
- 2026-09-06T12:17:16.163
- last_modified
- 2026-09-10T16:18:02.287
Related Entities (2)
DESCRIBED_BY (1)
→[Source]NVD
HAS_WEAKNESS (1)
→[Weakness]Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
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