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CVE-2026-108358: PhpSpreadsheet: XmlScanner Bypass via ISO-2022 Escape Sequences Allows XXE and Denial of Service

high Affects phpoffice/phpspreadsheet. Feed 2026.10.29.1, updated 2026-10-28; published .

PhpSpreadsheet: XmlScanner Bypass via ISO-2022 Escape Sequences Allows XXE and Denial of Service

Package
phpoffice/phpspreadsheet Composer
Affected versions
>=4.0.0 and <5.10.0 or >=3.3.0 and <3.10.8 or >=2.2.0 and <2.4.8 or >=2.0.0 and <2.1.19 or <1.30.7
Fixed in
5.10.0, 3.10.8, 2.4.8, 2.1.19, 1.30.7
Severity
high
Exploitation
not on CISA KEV · EPSS 0% (41.5th percentile)
Published
2026-10-27
Source
osv.dev

References

CWE-611CWE-776
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

Or keep it checked automatically: GitHub Action · pre-commit hook · GitLab CI · Laravel artisan command

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