[HIGH] PHPSpreadsheet: XLS/OLE sector-chain self-loop causes memory exhaustion

PKSA-r22k-87hv-mfk4 CVE-2026-59933 GHSA-xh5m-36r6-47m3

Affected package: phpoffice/phpspreadsheet

Affected version: <=1.30.5|>=2.0.0,<=2.1.17|>=2.2.0,<=2.4.6|>=3.3.0,<=3.10.6|>=4.0.0,<=5.8.0

Reported by:
GitHub