CVE-2026-107379: enshrined/svg-sanitize: Denial of Service via DTD Attribute Declaration Crash
A crafted SVG file (1009 bytes) crashes the PHP process when sanitized by enshrined/svg-sanitize (any version through 0.22.x). The sanitizer’s cleanAttributesOnWhitelist() method calls DOMElement::removeAttribute() twice on the same attribute name — first removing the explicit attribute, then attempting to remove the DTD #FIXED default — triggering a PHP ext/dom type confusion that kills the PHP-FPM worker.
Affected installations:
- enshrined/svg-sanitize: 45.2M Packagist downloads, 1.3M/month, 90+ dependents
- WordPress Safe SVG plugin: 1M+ active installs
- TYPO3: svg-sanitize integrated into core since v9
- Drupal: community module wrapping svg-sanitize
References
Code Behaviors & Features
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