Security advisory

{
  "id": "8a01daaa653f2c5e67fd4a94be2d956917c0ee8b41286f66c1edafd14e09b9f5",
  "url": "https://osv.dev/vulnerability/CVE-2020-15366",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-15366",
    "summary": "An issue was discovered in ajv.validate() in Ajv (aka Another JSON Schema Validator) 6.12.2. A carefully crafted JSON schema could be provided that allows execution of other code by prototype pollution. (While untrusted schemas are recommended against, the worst case of an untrusted schema should be a denial of service, not execution of code.)",
    "evidence": "osv:CVE-2020-15366",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-15366",
      "aliases": [
        "CVE-2020-15366",
        "GHSA-v88g-cgmw-v5xw"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/ajv-validator/ajv",
              "type": "GIT",
              "events": [
                {
                  "introduced": "6a671057ea6aae690b5967ee26a0ddf8452c6297"
                },
                {
                  "last_affected": "6a671057ea6aae690b5967ee26a0ddf8452c6297"
                },
                {
                  "fixed": "521c3a53f15f5502fb4a734194932535d311267c"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:ajv.js:ajv:6.12.2:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "6.12.2"
                      },
                      {
                        "last_affected": "6.12.2"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "range": [
                      {
                        "fixed": "521c3a53f15f5502fb4a734194932535d311267c"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v6.12.3"
                  }
                ]
              }
            }
          ],
          "versions": [
            "6.12.2",
            "v6.12.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-15366.json"
          }
        }
      ],
      "modified": "2026-10-20T10:51:55.499230549Z",
      "provider": "osv",
      "references": [
        "https://github.com/ajv-validator/ajv/releases/tag/v6.12.3",
        "https://github.com/ajv-validator/ajv/tags",
        "https://security.netapp.com/advisory/ntap-20240621-0007/",
        "https://hackerone.com/bugs?subject=user&report_id=894259"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-15366",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 383131,
  "published_at": "2020-07-15T20:15:13.38+00:00"
}