Quadratic complexity in os.path.expandvars() with user-controlled template_CVE-2025-6075

{
    "lastseen": "",
    "description": "If the value passed to os.path.expandvars() is user-controlled a \nperformance degradation is possible when expanding environment \nvariables.",
    "published": "2025-10-31T16:41:34.983Z",
    "modified": "2025-10-31T17:55:40.240Z",
    "type": "cve",
    "title": "Quadratic complexity in os.path.expandvars() with user-controlled template",
    "source": "PSF",
    "references": "https://github.com/python/cpython/issues/136065\nhttps://mail.python.org/archives/list/[email protected]/thread/IUP5QJ6D4KK6ULHOMPC7DPNKRYQTQNLA/\nhttps://github.com/python/cpython/commit/2e6150adccaaf5bd95d4c19dfd04a36e0b325d8c\nhttps://github.com/python/cpython/commit/631ba3407e3348ccd56ce5160c4fb2c5dc5f4d84\nhttps://github.com/python/cpython/commit/892747b4cf0f95ba8beb51c0d0658bfaa381ebca\nhttps://github.com/python/cpython/commit/9ab89c026aa9611c4b0b67c288b8303a480fe742\nhttps://github.com/python/cpython/commit/c8a5f3435c342964e0a432cc9fb448b7dbecd1ba\nhttps://github.com/python/cpython/commit/f029e8db626ddc6e3a3beea4eff511a71aaceb5c",
    "id": "CVE-2025-6075",
    "bulletinFamily": "",
    "cwe": [
        "CWE-400"
    ],
    "cvelist": null,
    "sourceData": "Python Software Foundation CPython 0",
    "sourceHref": "",
    "cvss": {
        "score": 1.8,
        "severity": "LOW",
        "vector": "CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
        "version": "4.0"
    },
    "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": "",
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            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "CPython",
    "version": "0",
    "vendor": "Python Software Foundation",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
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    "ai_score": 0
}