CVE-2026-57233

Status: Awaiting AnalysisHigh (8.1)—

Notepad++ is a free and open-source source code editor. Prior to 8.9.7, the WinGup decompress function joins untrusted ZIP entry names to unzipDestTo without canonical containment validation, allowing an entry such as ../mimeTools/mimeTools.dll to overwrite a DLL in a sibling plugin directory and execute attacker-controlled code when Notepad++ next loads that plugin. This issue is fixed in version 8.9.7.

CVSS

Version: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
Base score: 8.1

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.51%
Percentile among all scored CVEs: 41
Score date: 10/4/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1203 Exploitation for Client Executionexecution85 %
Primary impactT1565.001 Stored Data Manipulationimpact80 %
Secondary impactT1059 Command and Scripting Interpreterexecution75 %

Requiere interacción del usuario (UI:R) para descargar y aplicar la actualización; path traversal (CWE-22) en ZIP permite sobrescribir DLL de plugin, ejecutando código malicioso al cargar Notepad++.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Restrict Web-Based Content Restrict File and Directory Permissions Privileged Account Management Remote Data Storage Limit Software Installation Execution Prevention

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Notepad++ — Notepad++^AI

CWEs

CWE-22

References

Raw JSON (NVD)

Show

{
  "id": "CVE-2026-57233",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-57233",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-08-18T18:53:21.586615Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.1,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 5.2,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "notepad-plus-plus",
          "product": "notepad-plus-plus",
          "versions": [
            {
              "status": "affected",
              "version": "< 8.9.7"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-08-17T20:16:44.453",
  "references": [
    {
      "url": "https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.7",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-hjxw-84rf-wg5r",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/notepad-plus-plus/wingup/commit/7670296a5c7fdec624e0a45dbde51059a7d735a8",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/notepad-plus-plus/wingup/pull/106",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-hjxw-84rf-wg5r",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Notepad++ is a free and open-source source code editor. Prior to 8.9.7, the WinGup decompress function joins untrusted ZIP entry names to unzipDestTo without canonical containment validation, allowing an entry such as ../mimeTools/mimeTools.dll to overwrite a DLL in a sibling plugin directory and execute attacker-controlled code when Notepad++ next loads that plugin. This issue is fixed in version 8.9.7."
    }
  ],
  "lastModified": "2026-09-09T21:11:25.743",
  "sourceIdentifier": "security-advisories@github.com"
}