Starlette: Unvalidated request path concatenated into authority poisons request.url.hostname_CVE-2026-54282

{
    "lastseen": "",
    "description": "Starlette is a lightweight ASGI framework/toolkit. Prior to 1.3.0, the HTTP request path is not validated before being used to reconstruct request.url. Because request.url is rebuilt by concatenating {scheme}://{host}{path} and re-parsing the result, a path that does not begin with / (for example @google.com) moves the authority boundary during re-parsing, so request.url.hostname and request.url.netloc become attacker-controlled. Code that reads request.url.hostname (rather than the Host header or scope) can therefore be misled into trusting an attacker-supplied host. This vulnerability is fixed in 1.3.0.",
    "published": "2026-06-22T16:45:01.629Z",
    "modified": "2026-06-22T16:45:01.629Z",
    "type": "cve",
    "title": "Starlette: Unvalidated request path concatenated into authority poisons request.url.hostname",
    "source": "GitHub_M",
    "references": "https://github.com/Kludex/starlette/security/advisories/GHSA-jp82-jpqv-5vv3",
    "id": "CVE-2026-54282",
    "bulletinFamily": "",
    "cwe": [
        "CWE-706"
    ],
    "cvelist": null,
    "sourceData": "Kludex starlette < 1.3.0",
    "sourceHref": "",
    "cvss": {
        "score": 3.7,
        "severity": "LOW",
        "vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "baseScore": 0,
        "baseSeverity": "",
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        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "starlette",
    "version": "< 1.3.0",
    "vendor": "Kludex",
    "ai_description": "",
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    "ai_score": 0
}