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THREAT OPS › Threat News › [NVD] CVE-2026-86205 (MEDIUM 5.4) — 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

[NVD] CVE-2026-86205 (MEDIUM 5.4) — 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

mednvdPublished 2026-09-06

CVE-2026-86205 CVSS: 5.4 MEDIUM Published: 2026-09-06T12:17:15.277

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 browse

Indicators of compromise

CVE-2026-86205cve

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-86205