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CVE-2026-59933 PhpSpreadsheet: XLS/OLE sector-chain self-loop causes memory exhaustion

🗓️ 28 Jul 2026 17:29:27Reported by GitHub_MType 
cvelist
 cvelist
🔗 www.cve.org👁 12 Views

CVE-2026-59933: PhpSpreadsheet OLE reader loops sector chains in attacker XLS metadata, causing memory exhaustion.

Related
Affected
Refs
[
  {
    "vendor": "PHPOffice",
    "product": "PhpSpreadsheet",
    "versions": [
      {
        "version": ">= 4.0.0, < 5.8.1",
        "status": "affected"
      },
      {
        "version": ">= 3.3.0, < 3.10.7",
        "status": "affected"
      },
      {
        "version": ">= 2.2.0, < 2.4.7",
        "status": "affected"
      },
      {
        "version": ">= 2.0.0, < 2.1.18",
        "status": "affected"
      },
      {
        "version": "< 1.30.6",
        "status": "affected"
      }
    ]
  }
]

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