CVE-2026-86205

MediumCVSS 5.4/10Last modified Sep 8, 2026

Description

h3 versions before 2.0.1-rc.18 contain an open redirect vulnerability in the redirectBack() utility that fails to sanitize protocol-relative paths in the Referer header pathname. Attackers can craft a same-origin URL with a double-slash path segment that passes origin validation but produces a Location header interpreted by browsers as a protocol-relative redirect to an external domain.

Metrics

CVSS 3.1 5.4/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Weakness enumeration

CWE-601

Affected software

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

Vendor	Product	Versions
h3js	h3	>= 2.0.1-rc.17, < 2.0.1-rc.18

References

Timeline

Published: Sep 6, 2026
Last modified: Sep 8, 2026
NVD status: Awaiting Analysis

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