Algernon: Path traversal file write via savein()_CVE-2026-43982

{
    "lastseen": "",
    "description": "Algernon is a small self-contained pure-Go web server. Prior to 1.17.6, uploadedFileSaveIn() in lua/upload/upload.go uses filepath.Join() with the caller-supplied directory but performs no boundary check after joining. A directory of ../../../tmp resolves cleanly to /tmp, outside the web root. This vulnerability is fixed in 1.17.6.",
    "published": "2026-05-26T16:30:09.964Z",
    "modified": "2026-05-26T16:30:09.964Z",
    "type": "cve",
    "title": "Algernon: Path traversal file write via savein()",
    "source": "GitHub_M",
    "references": "https://github.com/xyproto/algernon/security/advisories/GHSA-2j2c-pv62-mmcp\nhttps://github.com/xyproto/algernon/issues/172",
    "id": "CVE-2026-43982",
    "bulletinFamily": "",
    "cwe": [
        "CWE-22"
    ],
    "cvelist": null,
    "sourceData": "xyproto algernon < 1.17.6",
    "sourceHref": "",
    "cvss": {
        "score": 8.7,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/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": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "algernon",
    "version": "< 1.17.6",
    "vendor": "xyproto",
    "ai_description": "Path traversal file write vulnerability via savein() function",
    "ai_severity": "High",
    "ai_vendor": "xyproto",
    "ai_product": "Algernon",
    "ai_version": "< 1.17.6",
    "ai_score": 8.7
}