CVE-2025-12875 (GCVE-0-2025-12875)

Vulnerability from cvelistv5 – Published: 2025-11-07 20:32 – Updated: 2026-02-24 06:25 X_Open Source
VLAI
Title
mruby array.c ary_fill_exec out-of-bounds write
Summary
A weakness has been identified in mruby 3.4.0. This vulnerability affects the function ary_fill_exec of the file mrbgems/mruby-array-ext/src/array.c. Executing a manipulation of the argument start/length can lead to out-of-bounds write. The attack needs to be launched locally. The exploit has been made available to the public and could be used for attacks. This patch is called 93619f06dd378db6766666b30c08978311c7ec94. It is best practice to apply a patch to resolve this issue.
Severity
4.8 (Medium)
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
5.3 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C
5.3 (Medium)
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-11-13 14:13 UTC
CWE
Assigner
VulDB CNA under the mitre root
CNA scorecard B 82/100 over 3970 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
n/a mruby Affected: 3.4.0
    cpe:2.3:a:mruby:mruby:*:*:*:*:*:*:*:*
Credits
tjbecker (VulDB User)
Show details on NVD website
To clipboard 

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                "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C",
                "version": "3.0"
              }
            },
            {
              "cvssV2_0": {
                "baseScore": 4.3,
                "vectorString": "AV:L/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:OF/RC:C",
                "version": "2.0"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-787",
                  "description": "Out-of-bounds Write",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            },
            {
              "descriptions": [
                {
                  "cweId": "CWE-119",
                  "description": "Memory Corruption",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-02-24T06:25:01.873Z",
            "orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
            "shortName": "VulDB"
          },
          "references": [
            {
              "name": "VDB-331511 | mruby array.c ary_fill_exec out-of-bounds write",
              "tags": [
                "vdb-entry",
                "technical-description"
              ],
              "url": "https://vuldb.com/?id.331511"
            },
            {
              "name": "VDB-331511 | CTI Indicators (IOB, IOC, IOA)",
              "tags": [
                "signature",
                "permissions-required"
              ],
              "url": "https://vuldb.com/?ctiid.331511"
            },
            {
              "name": "Submit #680879 | mruby 3.4.0 Out-of-bounds Write",
              "tags": [
                "third-party-advisory"
              ],
              "url": "https://vuldb.com/?submit.680879"
            },
            {
              "tags": [
                "issue-tracking"
              ],
              "url": "https://github.com/mruby/mruby/issues/6650"
            },
            {
              "tags": [
                "issue-tracking"
              ],
              "url": "https://github.com/mruby/mruby/issues/6650#event-20443453808"
            },
            {
              "tags": [
                "exploit",
                "issue-tracking"
              ],
              "url": "https://github.com/mruby/mruby/issues/6650#issuecomment-3430851605"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/makesoftwaresafe/mruby/commit/93619f06dd378db6766666b30c08978311c7ec94"
            },
            {
              "tags": [
                "product"
              ],
              "url": "https://github.com/mruby/mruby/"
            }
          ],
          "tags": [
            "x_open-source"
          ],
          "timeline": [
            {
              "lang": "en",
              "time": "2025-11-07T00:00:00.000Z",
              "value": "Advisory disclosed"
            },
            {
              "lang": "en",
              "time": "2025-11-07T01:00:00.000Z",
              "value": "VulDB entry created"
            },
            {
              "lang": "en",
              "time": "2025-12-02T17:31:54.000Z",
              "value": "VulDB entry last update"
            }
          ],
          "title": "mruby array.c ary_fill_exec out-of-bounds write"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
        "assignerShortName": "VulDB",
        "cveId": "CVE-2025-12875",
        "datePublished": "2025-11-07T20:32:07.100Z",
        "dateReserved": "2025-11-07T15:09:38.806Z",
        "dateUpdated": "2026-02-24T06:25:01.873Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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