Notepad3 Bundled Oniguruma compile_string_node() Heap Buffer Overflow via Crafted Regex Pattern Allows Arbitrary Code Execution

{
  "id": "3689de35447c5b95c076b87c76bd4f6e7d2f9a5460b87b6f993e05f8148bbdd2",
  "url": "https://osv.dev/vulnerability/CVE-2026-4744",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Notepad3 Bundled Oniguruma compile_string_node() Heap Buffer Overflow via Crafted Regex Pattern Allows Arbitrary Code Execution",
    "summary": "Out-of-bounds Read vulnerability in rizonesoft Notepad3 (‎scintilla/oniguruma/src modules). This vulnerability is associated with program files regcomp.C‎. This issue affects Notepad3: before 6.25.714.1.",
    "evidence": "osv:CVE-2026-4744",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-4744",
      "aliases": [
        "CVE-2026-4744"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/S:N/AU:N/R:U/V:D/RE:L/U:Amber"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/rizonesoft/notepad3",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "b7a2f03123b60d012126fb7bacf2ac253cbd60bd"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "6.25.714.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "6.25.714.1"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "RELEASE_6.24.1221.1",
            "RC3_6.24.309.1",
            "RC2_6.24.109.1",
            "RC_6.23.712.1",
            "RELEASE_6.23.203.2",
            "RC_5.22.1119.1",
            "RELEASE_5.21.1129.1",
            "RC_5.21.1109.1",
            "RELEASE_5.21.905.1",
            "RELEASE_5.21.227.1",
            "RC_5.21.207.1",
            "RC_5.20.829.2",
            "RELEASE_5.20.722.1",
            "RC2_5.20.218.2",
            "RC_5.20.218.2",
            "RELEASE_5.19.815.2595",
            "RC_5.19.726.2515",
            "RC_5.19.528.2228",
            "RELEASE_5.19.108.1602",
            "RC_5.18.1106.1432",
            "RC_5.18.1003.1309",
            "RELEASE_4.18.512.992",
            "RC_4.18.507.981",
            "RC_3.18.422.952"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-4744.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.448818742Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4744.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-4744",
        "https://github.com/rizonesoft/Notepad3/pull/5392",
        "https://github.com/rizonesoft/Notepad3"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-125"
        ],
        "cna_assigner": "GovTech CSG",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4744.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-4744",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 499548,
  "published_at": "2026-03-24T03:26:11.751+00:00"
}