Kestra: Path traversal via URL-encoded “%2E%2E” in execution and namespace file endpoints allows arbitrary file read_CVE-2026-45807

{
    "lastseen": "",
    "description": "Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.43 and 1.3.19, several Kestra API endpoints accept a kestra:// URI from the client and pass it through StorageInterface.parentTraversalGuard before reading the underlying file from the local storage backend. The guard only inspects the literal URI.toString(), so a URL-encoded .. written as %2E%2E slips through. The downstream code then calls URI.getPath(), which decodes %2E%2E back to .., and the resulting path is handed to Paths.get(...) without normalization. The OS resolves the .. segments at open(2) time, so an authenticated user with a single execution can read any file the Kestra process has access to on the host filesystem (/etc/passwd, mounted secrets, other tenants' execution outputs, etc.). This vulnerability is fixed in 1.0.43 and 1.3.19.",
    "published": "2026-06-26T20:57:13.891Z",
    "modified": "2026-06-26T20:57:13.891Z",
    "type": "cve",
    "title": "Kestra: Path traversal via URL-encoded \"%2E%2E\" in execution and namespace file endpoints allows arbitrary file read",
    "source": "GitHub_M",
    "references": "https://github.com/kestra-io/kestra/security/advisories/GHSA-3529-p4wf-xp79",
    "id": "CVE-2026-45807",
    "bulletinFamily": "",
    "cwe": [
        "CWE-22"
    ],
    "cvelist": null,
    "sourceData": "kestra-io kestra < 1.0.43\nkestra-io kestra >= 1.1.0, < 1.3.19",
    "sourceHref": "",
    "cvss": {
        "score": 7.7,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
        "version": "3.1"
    },
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    },
    "href": "",
    "category_name": "CVE",
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    "product": "kestra",
    "version": "< 1.0.43",
    "vendor": "kestra-io",
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