GHSA-cw7v-45wm-mcf2.json

{
  "schema_version": "1.4.0",
  "id": "GHSA-cw7v-45wm-mcf2",
  "modified": "2026-03-27T22:21:29Z",
  "published": "2026-03-27T22:21:26Z",
  "aliases": [
    "CVE-2026-29905"
  ],
  "summary": "Kirby CMS has Persistent DoS via Malformed Image Upload",
  "details": "## Summary\n\nKirby CMS through version 5.1.4 allows an authenticated user with Editor permissions to cause a persistent Denial of Service (DoS) via a malformed image upload.\n\n## Details\n\nThe vulnerability is caused by improper validation of the return value of PHP's `getimagesize()` function. When a malformed file is uploaded with a valid image extension (e.g., `.jpg`), the function returns `false` instead of an expected array.\n\nThe application fails to handle this condition properly and proceeds with image processing, resulting in a fatal `TypeError`. This leads to persistent application crashes when the affected file is accessed.\n\n## Impact\n\n- Persistent Denial of Service (DoS)\n- Affected pages return HTTP 500 errors\n- Requires manual removal of the malformed file to restore functionality\n- Exploitable by authenticated users with Editor permissions",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "getkirby/cms"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "5.0.0"
            },
            {
              "fixed": "5.2.0-rc.1"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Stalin-143/CVE-2026-29905/security/advisories/GHSA-cw7v-45wm-mcf2"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-29905"
    },
    {
      "type": "WEB",
      "url": "https://drive.google.com/file/d/1MwvvSYIwnC8kOIzjycGMQZw4d2K2ef8h/view?usp=sharing"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Stalin-143/CVE-2026-29905"
    },
    {
      "type": "WEB",
      "url": "https://github.com/getkirby/kirby/releases/tag/5.2.0-rc.1"
    }
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20"
    ],
    "severity": "MODERATE",
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-27T22:21:26Z",
    "nvd_published_at": "2026-03-26T17:16:34Z"
  }
}