urllib3 allows an unbounded number of links in the decompression chain_CVE-2025-66418

{
    "lastseen": "",
    "description": "urllib3 is a user-friendly HTTP client library for Python. Starting in version 1.24 and prior to 2.6.0, the number of links in the decompression chain was unbounded allowing a malicious server to insert a virtually unlimited number of compression steps leading to high CPU usage and massive memory allocation for the decompressed data. This vulnerability is fixed in 2.6.0.",
    "published": "2025-12-05T16:02:15.271Z",
    "modified": "2025-12-05T18:15:28.505Z",
    "type": "cve",
    "title": "urllib3 allows an unbounded number of links in the decompression chain",
    "source": "GitHub_M",
    "references": "https://github.com/urllib3/urllib3/security/advisories/GHSA-gm62-xv2j-4w53\nhttps://github.com/urllib3/urllib3/commit/24d7b67eac89f94e11003424bcf0d8f7b72222a8",
    "id": "CVE-2025-66418",
    "bulletinFamily": "",
    "cwe": [
        "CWE-770"
    ],
    "cvelist": null,
    "sourceData": "urllib3 urllib3 >= 1.24, < 2.6.0",
    "sourceHref": "",
    "cvss": {
        "score": 8.9,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
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        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
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        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "urllib3",
    "version": ">= 1.24, < 2.6.0",
    "vendor": "urllib3",
    "ai_description": "Unbounded decompression chain vulnerability in urllib3",
    "ai_severity": "High",
    "ai_vendor": "urllib3",
    "ai_product": "urllib3",
    "ai_version": "1.24 to 2.6.0",
    "ai_score": 8.9
}