{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:notepad-plus-plus:notepad\\+\\+:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "8.9.6.1"
              }
            ],
            "source": [
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "41dd976310db0ba551bb8a2810b60331df3a77f5"
            },
            {
              "fixed": "f20a0888a92ce557a339b833cd9d9d8e97dc797d"
            }
          ],
          "repo": "https://github.com/notepad-plus-plus/notepad-plus-plus",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-r39g-3mcw-xcg2"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-125"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48770.json"
  },
  "details": "Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, a local process in the same interactive Windows session can send a malformed WM_COPYDATA message to Notepad++ using the COPYDATA_FULL_CMDLINE path. The handler appears to process COPYDATASTRUCT.lpData as an unbounded NUL-terminated wchar_t* instead of enforcing COPYDATASTRUCT.cbData. This vulnerability is fixed in 8.9.6.1.",
  "id": "CVE-2026-48770",
  "modified": "2026-07-15T01:49:02.194218797Z",
  "published": "2026-06-26T20:22:17.683Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48770.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-r39g-3mcw-xcg2"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-48770"
    },
    {
      "type": "FIX",
      "url": "https://github.com/notepad-plus-plus/notepad-plus-plus/commit/f20a0888a92ce557a339b833cd9d9d8e97dc797d"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Notepad++ WM_COPYDATA COPYDATA_FULL_CMDLINE local DoS crash"
}