Litestar has a CORS origin allowlist bypass due to unescaped regex metacharacters in allowed origins_CVE-2026-25478

{
    "lastseen": "",
    "description": "Litestar is an Asynchronous Server Gateway Interface (ASGI) framework. Prior to 2.20.0, CORSConfig.allowed_origins_regex is constructed using a regex built from configured allowlist values and used with fullmatch() for validation. Because metacharacters are not escaped, a malicious origin can match unexpectedly. The check relies on allowed_origins_regex.fullmatch(origin). This vulnerability is fixed in 2.20.0.",
    "published": "2026-02-09T18:46:56.445Z",
    "modified": "2026-02-09T18:46:56.445Z",
    "type": "cve",
    "title": "Litestar has a CORS origin allowlist bypass due to unescaped regex metacharacters in allowed origins",
    "source": "GitHub_M",
    "references": "https://github.com/litestar-org/litestar/security/advisories/GHSA-2p2x-hpg8-cqp2\nhttps://github.com/litestar-org/litestar/commit/eb87703b309efcc0d1b087dcb12784e76b003d5a\nhttps://docs.litestar.dev/2/release-notes/changelog.html#2.20.0\nhttps://github.com/litestar-org/litestar/releases/tag/v2.20.0",
    "id": "CVE-2026-25478",
    "bulletinFamily": "",
    "cwe": [
        "CWE-942"
    ],
    "cvelist": null,
    "sourceData": "litestar-org litestar < 2.20.0",
    "sourceHref": "",
    "cvss": {
        "score": 7.4,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "litestar",
    "version": "< 2.20.0",
    "vendor": "litestar-org",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}