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CVE PROGRAM SOURCE RECORD5.3 Medium

CVE-2026-86205

h3 before 2.0.1-rc.18 Open Redirect via redirectBack()

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

h3js h3

Default version status: unaffected

  • 2.0.1-rc.17 to < 2.0.1-rc.18affected
  • 2.0.1-rc.18unaffected
pkg:npm/h3

References