CVE-2026-86205

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Source
https://cve.org/CVERecord?id=CVE-2026-86205
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-86205.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-86205
Aliases
Published
2026-09-06T12:00:25Z
Modified
2026-09-10T03:30:21Z
Severity
  • 5.3 (Medium) CVSS_V4 - 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 CVSS Calculator
Summary
h3 before 2.0.1-rc.18 Open Redirect via redirectBack()
Details

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.

Database specific 
{
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-601"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86205.json"
}
References

Affected packages

Git / github.com/h3js/h3

Affected ranges

Type
GIT
Repo
https://github.com/h3js/h3
Events
Introduced
388b8f06e060a219d11bbc6be7f70f38d8bbea01
Fixed
cb70e1ba513be827bb3698127bb7d06467412911
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "2.0.1-rc.17"
        },
        {
            "fixed": "2.0.1-rc.18"
        },
        {
            "introduced": "0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "DESCRIPTION"
    ]
}

Affected versions

v2.*
v2.0.1-rc.17

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-86205.json"