{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:cacti:cacti:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.2.31"
              }
            ],
            "source": [
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1e8eaca26b84b128c39ce8cc8ece42d7ff76aac1"
            },
            {
              "fixed": "d2a698854956e9e4e53da9eab5b5719ae40e6893"
            }
          ],
          "repo": "https://github.com/cacti/cacti",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-23g4-vf2j-94w4"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-474"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39894.json"
  },
  "details": "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.",
  "id": "CVE-2026-39894",
  "modified": "2026-07-15T01:49:08.675007351Z",
  "published": "2026-06-24T21:55:49.857Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39894.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/Cacti/cacti/security/advisories/GHSA-23g4-vf2j-94w4"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39894"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/Cacti/cacti/issues/7011"
    },
    {
      "type": "FIX",
      "url": "https://github.com/Cacti/cacti/commit/d2a698854956e9e4e53da9eab5b5719ae40e6893"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Cacti: RRDtool metric shift via LC_NUMERIC locale comma decimal formatting"
}