{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:notepad-plus-plus:notepad\\+\\+:8.9.3:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "8.9.3"
              },
              {
                "last_affected": "8.9.3"
              }
            ],
            "source": "CPE_STRING"
          },
          "events": [
            {
              "introduced": "8452101a4b349c46b19af7d7010588d3b540294f"
            },
            {
              "last_affected": "8452101a4b349c46b19af7d7010588d3b540294f"
            }
          ],
          "repo": "https://github.com/notepad-plus-plus/notepad-plus-plus",
          "type": "GIT"
        }
      ],
      "versions": [
        "8.9.3"
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-134"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6539.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "fixed": "8.9.4"
          }
        ],
        "source": "AFFECTED_FIELD"
      },
      {
        "extracted_events": [
          {
            "fixed": "8.9.4"
          }
        ],
        "source": "CPE_FIELD"
      }
    ]
  },
  "details": "Notepad++ 8.9.3 contains a format string injection vulnerability in the Find Results panel handler that allows attackers to cause denial of service and information disclosure by crafting a malicious nativeLang.xml language pack file. Attackers can distribute a poisoned language pack through community channels that triggers format string interpretation when a user performs search operations, leading to access violations and potential leakage of stack or register contents.",
  "id": "CVE-2026-6539",
  "modified": "2026-08-07T11:31:13.086854620Z",
  "published": "2026-04-30T20:31:54.961Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6539.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6539"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/notepad-format-string-injection-via-nativelang-xml"
    },
    {
      "type": "FIX",
      "url": "https://notepad-plus-plus.org/news/v894-released/"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Notepad++ 8.9.3 Format String Injection via nativeLang.xml"
}