Threat database

svg-sanitizer is a PHP SVG/XML sanitizer. Prior to 1.0.0, Resolver::processReferences() in src/ElementReference/Resolver.php builds the SVG <use> reference graph with a case-sensitive href attribute predicate before cleanHrefAttributes() normalizes mixed-case names. An attacker can provide xlink:HrEf on nested <use> elements so the graph omits those references, after which the sanitizer converts the attribute to canonical xlink:href and returns the live nesting structure without applying the useNestingLimit protection. A consuming application that renders the sanitized SVG can therefore be exposed to the resource exhaustion that control is designed to prevent. This issue is fixed in version 1.0.0.

A cross-site scripting (XSS) vulnerability exists in darylldoyle svg-sanitizer versions prior to 1.0.0. The issue arises because the sanitizer validates SVG href attributes after XML DTD entity expansion but serializes the original entity reference without the DTD declaration. This discrepancy allows crafted entities to bypass validation and later be interpreted as JavaScript URLs during HTML5 rendering, enabling script execution in the embedding page's origin. The vulnerability is fixed in version 1.0.0.

A resource allocation vulnerability exists in darylldoyle svg-sanitizer versions prior to 1.0.0. The issue arises from a crafted SVG DTD with a #FIXED attribute default that causes a double removal of the same attribute, corrupting libxml state and terminating the PHP worker. This can be exploited by submitting malicious SVG content to degrade or exhaust application availability. The vulnerability is fixed in version 1.0.0.

savg-sanitizer is a PHP SVG/XML sanitizer. Prior to version 0.22.0, the sanitization logic in the cleanXlinkHrefs method only searches for lower-case attribute name, which allows to by-pass the isHrefSafeValue check. As a result this allows cross-site scripting or linking to external domains. This issue has been patched in version 0.22.0.