CVE Watch6 sept 2026

CVE-2026-86251

h3 versions before 1.15.9 contain a path traversal vulnerability in the serveStatic utility. A double-decoding flaw allows a request path co

CVSS

5.9

Medio

EPSS

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KEV

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Exploit Today

0-100

Publicado: 6 sept 2026 · Última mod.: 6 sept 2026 · CWE-22

EPSS · 30d

Sin historial EPSS suficiente todavía.

Descripción técnica

h3 versions before 1.15.9 contain a path traversal vulnerability in the serveStatic utility. A double-decoding flaw allows a request path containing double-encoded dot sequences (e.g. %252e%252e) to be decoded to %2e%2e, which survives resolveDotSegments() because that function only checks for literal '.' characters. When the resulting asset ID is resolved by URL-based backends (CDN, S3, object storage), %2e%2e is interpreted as '..' per RFC 3986, enabling path traversal to read arbitrary files from the backend.

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