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

high Affects phpoffice/phpspreadsheet. Feed 2026.10.29.4, updated 2026-10-29; published .

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

Package
phpoffice/phpspreadsheet Composer
Affected versions
>=4.0.0 and <5.8.1 or >=3.3.0 and <3.10.7 or >=2.2.0 and <2.4.7 or >=2.0.0 and <2.1.18 or <1.30.6
Fixed in
5.8.1, 3.10.7, 2.4.7, 2.1.18, 1.30.6
Severity
high  CVSS 7.5
Exploitation
not on CISA KEV · EPSS 0% (39.9th percentile)
Published
2026-07-23
Source
osv.dev

References

CWE-400CWE-835
NVD recordphpoffice/phpspreadsheet advisories

Am I affected?

Find out in one command. phpwarden checks your composer.lock against this advisory and 20,000+ others, ranked by real-world exploitation (CISA KEV + EPSS). Free, offline, open data.

# PHP projects (recommended)
composer require --dev phpwarden/phpwarden
# then
vendor/bin/phpwarden deps composer.lock

# or, without Composer
pipx install phpwarden   &&   phpwarden deps composer.lock

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