CVE-2026-86205
5.3
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| h3js | h3 | 2.0.1-rc.17 < 2.0.1-rc.18 | affected |
| h3js | h3 | 2.0.1-rc.18 | unaffected |
Weaknesses
- CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
References
- https://github.com/h3js/h3/security/advisories/GHSA-fp4x-ggrf-wmc6
- https://www.vulncheck.com/advisories/h3-before-2.0.1-rc.18-open-redirect-via-redirectback
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