Cacti: RRDtool metric shift via LC_NUMERIC locale comma decimal formatting_CVE-2026-39894

{
    "lastseen": "",
    "description": "Cacti is an open source performance and fault management framework. In versions 1.2.30 and below, the locale-dependent decimal formatting in rrdtool_function_update() can corrupt RRDtool metric values. The rrdtool_function_update() function checks metric values with is_numeric() and concatenates them into the RRDtool update command via PHP string interpolation. PHP's string cast of floats is locale-sensitive: if LC_NUMERIC uses comma as decimal separator (e.g., de_DE), a value of 1.5 becomes \"1,5\". RRDtool expects . as decimal separator, causing metric data to shift into wrong columns or be silently dropped. No setlocale() reset is present in the update path. This causes a data integrity issue, but is not remotely exploitable; it requires server locale misconfiguration. The issue has been fixed in version 1.2.31.",
    "published": "2026-06-24T21:55:49.857Z",
    "modified": "2026-06-24T21:55:49.857Z",
    "type": "cve",
    "title": "Cacti: RRDtool metric shift via LC_NUMERIC locale comma decimal formatting",
    "source": "GitHub_M",
    "references": "https://github.com/Cacti/cacti/security/advisories/GHSA-23g4-vf2j-94w4\nhttps://github.com/Cacti/cacti/issues/7011\nhttps://github.com/Cacti/cacti/commit/d2a698854956e9e4e53da9eab5b5719ae40e6893",
    "id": "CVE-2026-39894",
    "bulletinFamily": "",
    "cwe": [
        "CWE-474"
    ],
    "cvelist": null,
    "sourceData": "Cacti cacti < 1.2.31",
    "sourceHref": "",
    "cvss": {
        "score": 2.9,
        "severity": "LOW",
        "vector": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
        "version": "3.1"
    },
    "cvss2": [],
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        "baseScore": 0,
        "baseSeverity": "",
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        "privilegesRequired": "",
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        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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            "baseScore": 0,
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "cacti",
    "version": "< 1.2.31",
    "vendor": "Cacti",
    "ai_description": "",
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    "ai_score": 0
}