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CVE-2026-86253

h3 before 1.15.6 Path Traversal via Percent-Encoded Dot Segments PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
h3js / h3affected 0 before 1.15.6; unaffected 1.15.6; affected 2.0.0-beta.0 before 2.0.1-rc.15; unaffected 2.0.1-rc.15

CWE

CWE-22

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.