xlnt-community xlnt Encrypted XLSX File base64.cpp decode_base64 off-by-one_CVE-2026-2703

{
    "lastseen": "",
    "description": "A weakness has been identified in xlnt-community xlnt up to 1.6.1. Impacted is the function xlnt::detail::decode_base64 of the file source/detail/cryptography/base64.cpp of the component Encrypted XLSX File Parser. Executing a manipulation can lead to off-by-one. The attack requires local access. The exploit has been made available to the public and could be used for attacks. This patch is called f2d7bf494e5c52706843cf7eb9892821bffb0734. Applying a patch is advised to resolve this issue.",
    "published": "2026-02-19T04:02:10.794Z",
    "modified": "2026-02-19T04:02:10.794Z",
    "type": "cve",
    "title": "xlnt-community xlnt Encrypted XLSX File base64.cpp decode_base64 off-by-one",
    "source": "VulDB",
    "references": "https://vuldb.com/?id.346649\nhttps://vuldb.com/?ctiid.346649\nhttps://vuldb.com/?submit.754377\nhttps://github.com/xlnt-community/xlnt/issues/137\nhttps://github.com/oneafter/0128/blob/main/xl1/repro\nhttps://github.com/xlnt-community/xlnt/commit/f2d7bf494e5c52706843cf7eb9892821bffb0734\nhttps://github.com/xlnt-community/xlnt/",
    "id": "CVE-2026-2703",
    "bulletinFamily": "",
    "cwe": [
        "CWE-193",
        "CWE-189"
    ],
    "cvelist": null,
    "sourceData": "xlnt-community xlnt 1.6.0\nxlnt-community xlnt 1.6.1",
    "sourceHref": "",
    "cvss": {
        "score": 4.8,
        "severity": "MEDIUM",
        "vector": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P",
        "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": "xlnt",
    "version": "1.6.0",
    "vendor": "xlnt-community",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}