Security advisory

{
  "id": "a25abd208d70cdabdacadfd24aef7cbc0ac003bc54cc21e3a0628a13327a7c51",
  "url": "https://osv.dev/vulnerability/CVE-2020-25462",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-25462",
    "summary": "Heap buffer overflow in the fxCheckArrowFunction function at moddable/xs/sources/xsSyntaxical.c:3562 in Moddable SDK before OS200903.",
    "evidence": "osv:CVE-2020-25462",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2020-25462",
      "aliases": [
        "CVE-2020-25462"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/moddable-opensource/moddable",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "13b939d91415059d75d666eeb0150a406e8aad1c"
                },
                {
                  "fixed": "5639abb24b6d725554969dc0be5822edb54a4a08"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:moddable:moddable:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "os200908"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "5639abb24b6d725554969dc0be5822edb54a4a08"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "OS200903"
                  }
                ]
              }
            }
          ],
          "versions": [
            "OS200831"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-25462.json",
            "vanir_signatures": [
              {
                "id": "CVE-2020-25462-3324651c",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "163763250241959081810483249651220768029",
                    "196167388763708074432343828433249770400",
                    "259217368796255899204184698927223548289",
                    "170851852752589358369262650058775792039"
                  ]
                },
                "source": "https://github.com/moddable-opensource/moddable/commit/13b939d91415059d75d666eeb0150a406e8aad1c",
                "target": {
                  "file": "tools/adpcm-lib.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2020-25462-f94c5122",
                "digest": {
                  "length": 1469,
                  "function_hash": "296004142866316237889337510996652216417"
                },
                "source": "https://github.com/moddable-opensource/moddable/commit/13b939d91415059d75d666eeb0150a406e8aad1c",
                "target": {
                  "file": "tools/adpcm-lib.c",
                  "function": "adpcm_decode_block"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T13:57:27Z"
          }
        }
      ],
      "modified": "2026-10-20T13:57:27.197709905Z",
      "provider": "osv",
      "references": [
        "https://github.com/Moddable-OpenSource/moddable/releases/tag/OS200903",
        "https://github.com/Moddable-OpenSource/moddable/issues/432"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-25462",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 388453,
  "published_at": "2020-12-04T17:15:12.493+00:00"
}