CVE-2026-39894 (GCVE-0-2026-39894)

Vulnerability from cvelistv5 – Published: 2026-06-24 21:55 – Updated: 2026-06-25 13:02
VLAI
Title
Cacti: RRDtool metric shift via LC_NUMERIC locale comma decimal formatting
Summary
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.
Severity
2.9 (Low)
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-474 - Use of Function with Inconsistent Implementations
Assigner
References
Impacted products
Vendor Product Version
Cacti cacti Affected: < 1.2.31
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-39894",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-25T13:02:29.458961Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-25T13:02:42.706Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "cacti",
          "vendor": "Cacti",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.2.31"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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\u0027s 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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 2.9,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-474",
              "description": "CWE-474: Use of Function with Inconsistent Implementations",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-24T21:55:49.857Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/Cacti/cacti/security/advisories/GHSA-23g4-vf2j-94w4",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/Cacti/cacti/security/advisories/GHSA-23g4-vf2j-94w4"
        },
        {
          "name": "https://github.com/Cacti/cacti/issues/7011",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Cacti/cacti/issues/7011"
        },
        {
          "name": "https://github.com/Cacti/cacti/commit/d2a698854956e9e4e53da9eab5b5719ae40e6893",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Cacti/cacti/commit/d2a698854956e9e4e53da9eab5b5719ae40e6893"
        }
      ],
      "source": {
        "advisory": "GHSA-23g4-vf2j-94w4",
        "discovery": "UNKNOWN"
      },
      "title": "Cacti: RRDtool metric shift via LC_NUMERIC locale comma decimal formatting"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-39894",
    "datePublished": "2026-06-24T21:55:49.857Z",
    "dateReserved": "2026-04-07T20:32:03.011Z",
    "dateUpdated": "2026-06-25T13:02:42.706Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-39894",
      "date": "2026-06-26",
      "epss": "0.00104",
      "percentile": "0.01243"
    },
    "vulnrichment": {
      "containers": "{\"cna\": {\"title\": \"Cacti: RRDtool metric shift via LC_NUMERIC locale comma decimal formatting\", \"source\": {\"advisory\": \"GHSA-23g4-vf2j-94w4\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 2.9, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"LOW\", \"vectorString\": \"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N\", \"integrityImpact\": \"LOW\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"Cacti\", \"product\": \"cacti\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 1.2.31\"}]}], \"references\": [{\"url\": \"https://github.com/Cacti/cacti/security/advisories/GHSA-23g4-vf2j-94w4\", \"name\": \"https://github.com/Cacti/cacti/security/advisories/GHSA-23g4-vf2j-94w4\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/Cacti/cacti/issues/7011\", \"name\": \"https://github.com/Cacti/cacti/issues/7011\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/Cacti/cacti/commit/d2a698854956e9e4e53da9eab5b5719ae40e6893\", \"name\": \"https://github.com/Cacti/cacti/commit/d2a698854956e9e4e53da9eab5b5719ae40e6893\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"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\u0027s 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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-474\", \"description\": \"CWE-474: Use of Function with Inconsistent Implementations\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-06-24T21:55:49.857Z\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-39894\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-25T13:02:29.458961Z\"}}}], \"providerMetadata\": {\"shortName\": \"CISA-ADP\", \"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"dateUpdated\": \"2026-06-25T13:02:35.359Z\"}}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-39894\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-24T21:55:49.857Z\", \"dateReserved\": \"2026-04-07T20:32:03.011Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-06-24T21:55:49.857Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.