CVE•Published 2026-09-06•Modified 2026-09-08•0 articles on news•4 live references•NVD data
CVE-2026-86205
Vulnerability data via NVD (ingested)
CVSS v3.1
5.4
MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
EPSS percentile
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Weaknesses (CWE)
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.
Timeline
Published 2026-09-06
Modified 2026-09-08
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
More intel sources (5)
Shodan report
vuln:CVE-2026-86205Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-86205Censys host search filtered to this CVE id.
grep.app
CVE-2026-86205Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-86205GitHub code search for direct mentions.
Google dork
"CVE-2026-86205" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-86205 on GitHub.
We haven't classified any articles referencing CVE-2026-86205 yet. The external references above still apply.