{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "source": "REFERENCES"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "381c0125efab49f6f0dbc08317d01d55717672af"
            }
          ],
          "repo": "https://github.com/benjamine/jsondiffpatch",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "snyk",
    "cwe_ids": [
      "CWE-1321"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8657.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "fixed": "0.7.6"
          },
          {
            "fixed": "*"
          }
        ],
        "source": "AFFECTED_FIELD"
      },
      {
        "extracted_events": [
          {
            "fixed": "0.7.6"
          }
        ],
        "source": "DESCRIPTION"
      }
    ]
  },
  "details": "Versions of the package jsondiffpatch before 0.7.6 are vulnerable to Prototype Pollution via the jsondiffpatch.patch() and jsondiffpatch/formatters/jsonpatch.patch() APIs. An attacker can perform prototype pollution by supplying crafted delta or JSON Patch documents, as attacker-controlled property names and path segments are used to traverse and modify objects without restricting access to special properties like __proto__ or constructor.prototype, allowing modification of Object.prototype.",
  "id": "CVE-2026-8657",
  "modified": "2026-08-24T03:31:28.061236713Z",
  "published": "2026-05-16T05:00:09.867Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://gist.github.com/yuki-matsuhashi/e570fb1579ae1f3190059b622b0473fb"
    },
    {
      "type": "WEB",
      "url": "https://github.com/benjamine/jsondiffpatch/blob/96112c35a98f9201dd75d67fcee68a952c79e2fe/packages/jsondiffpatch/src/filters/nested.ts%23L107-L115"
    },
    {
      "type": "WEB",
      "url": "https://github.com/benjamine/jsondiffpatch/blob/96112c35a98f9201dd75d67fcee68a952c79e2fe/packages/jsondiffpatch/src/filters/nested.ts%23L82-L87"
    },
    {
      "type": "WEB",
      "url": "https://github.com/benjamine/jsondiffpatch/blob/96112c35a98f9201dd75d67fcee68a952c79e2fe/packages/jsondiffpatch/src/formatters/jsonpatch-apply.ts%23L146-L168"
    },
    {
      "type": "WEB",
      "url": "https://github.com/benjamine/jsondiffpatch/blob/96112c35a98f9201dd75d67fcee68a952c79e2fe/packages/jsondiffpatch/src/formatters/jsonpatch-apply.ts%23L171-L199"
    },
    {
      "type": "WEB",
      "url": "https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-16732792"
    },
    {
      "type": "WEB",
      "url": "https://security.snyk.io/vuln/SNYK-JS-JSONDIFFPATCH-16322990"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8657.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-8657"
    },
    {
      "type": "FIX",
      "url": "https://github.com/benjamine/jsondiffpatch/commit/381c0125efab49f6f0dbc08317d01d55717672af"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N/E:P",
      "type": "CVSS_V4"
    }
  ]
}