Story
The woes of sanitizing SVGs
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Overview
Scratch has a history of SVG-related vulnerabilities due to the parsing of user-generated content into an <svg> element, which is appended to the main document. This operation poses inherent security risks, leading Scratch to implement increasingly complex sanitization methods.
Summary from muffin.ink.
Reports
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muffin.ink
The woes of sanitizing SVGs
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Community reactions
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Hacker News · muffin.ink
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Historical count: 5 · 5 saved in sample · Historical sample
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Based on 5 sampled comments from this thread. Analyzed 2026-04-27.
- Praise: The article highlights the importance of Content Security Policy (CSP) as a credible solution for addressing HTTP leak problems, which is crucial for enhancing web security.
- Praise: The suggestion of a sandbox attribute for inline SVG tags could significantly improve security by restricting dynamic content, though it may face browser support challenges.
- Concern: The lack of an industry standard for SVG sanitization hampers usability, as users cannot guarantee compatibility across different tools and browsers.
- Concern: Relying on regular expressions for sanitizing SVGs is problematic, as it can lead to security vulnerabilities and does not address the complexity of SVG content.