python-dotenv: Symlink following in set_key allows arbitrary file overwrite via cross-device rename fallback_CVE-2026-28684

{
    "lastseen": "",
    "description": "python-dotenv reads key-value pairs from a .env file and can set them as environment variables. Prior to version 1.2.2, `set_key()` and `unset_key()` in python-dotenv follow symbolic links when rewriting `.env` files, allowing a local attacker to overwrite arbitrary files via a crafted symlink when a cross-device rename fallback is triggered. Users should upgrade to v.1.2.2 or, as a workaround, apply the patch manually.",
    "published": "2026-04-20T16:25:12.302Z",
    "modified": "2026-04-20T17:43:09.477Z",
    "type": "cve",
    "title": "python-dotenv: Symlink following in set_key allows arbitrary file overwrite via cross-device rename fallback",
    "source": "GitHub_M",
    "references": "https://github.com/theskumar/python-dotenv/security/advisories/GHSA-mf9w-mj56-hr94\nhttps://github.com/theskumar/python-dotenv/commit/790c5c02991100aa1bf41ee5330aca75edc51311\nhttps://github.com/theskumar/python-dotenv/releases/tag/v1.2.2",
    "id": "CVE-2026-28684",
    "bulletinFamily": "",
    "cwe": [
        "CWE-59",
        "CWE-61"
    ],
    "cvelist": null,
    "sourceData": "theskumar python-dotenv < 1.2.2",
    "sourceHref": "",
    "cvss": {
        "score": 6.6,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H",
        "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": "python-dotenv",
    "version": "< 1.2.2",
    "vendor": "theskumar",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}