medium5.9
CVE-2026-86253
h3 (npm package) versions <= 2.0.1-rc.14 contain a path traversal vulnerability in serveStatic().
Impact
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.
Affected products
| Product | Affected versions |
|---|---|
| H3 (Npm Package) | through 2.0.1-rc.14 |
Versions were read from the advisory text. No structured product data has been published for this record yet.