CVE-2026-86253

MediumCVSS 5.9/10Last modified Sep 10, 2026

Description

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.

Metrics

CVSS 3.1 5.9/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-22

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
h3js	h3	< 1.15.6; >= 2.0.0-beta.0, < 2.0.1-rc.15

References

Timeline

Published: Sep 6, 2026
Last modified: Sep 10, 2026
NVD status: Awaiting Analysis

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