Listen to this Post
The vulnerability stems from a case-sensitive mismatch during reference graph collection versus subsequent attribute normalization in the SVG sanitization library. Specifically, `Resolver::processReferences()` collects `
DailyCVE Form:
Platform: enshrined/svg-sanitize
Version: < 0.22.0
Vulnerability : Desynchronization Bypass
Severity: Moderate
date: 2025-08-12
Prediction: 2025-08-12
What Undercode Say
Bash Commands and Codes
$orig = file_get_contents(<strong>DIR</strong> . '/svgsan/tests/data/useDosTest.svg');
$mut = str_replace('xlink:href', 'xlink:HrEf', $orig);
$s = new \enshrined\svgSanitize\Sanitizer();
$s->removeRemoteReferences(true);
$out = $s->sanitize($mut);
Exploit: (Educational Purposes!)
An attacker with permission to upload or post an SVG file crafts a payload containing elements with mixed-case attributes like xlink:HrEf. Because the reference collector misses the node due to case sensitivity, no counter-measures are applied, but the subsequent cleaner normalizes the attribute name back to standard xlink:href, delivering an active denial-of-service vector to the application renderer.
Protection:
Update the `enshrined/svg-sanitize` library to version 0.22.0 or newer, where case-insensitive matching is properly enforced across both reference resolution and attribute cleaning phases.
Impact:
Allows attackers to bypass nesting-DoS protections, passing nested reference structures that can consume excessive downstream memory or CPU resources during rendering.
🎯Let’s Practice Exploiting & Learn Patching For Free:
🎓 Live Courses & Certifications:
Join Undercode Academy for Verified Certifications
🚀 Request a Custom Project:
Secure, high-velocity infrastructure and disruptive technological engineering. Contact our engineering team for high-tier development and proprietary systems:
[email protected]
💎 Smart Architecture | 🛡️ Secure by Design | ⭐ Trusted by Thousands
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
