Subresource Integrity for SVG Files
When loading SVGs from a third-party CDN, SRI hashes verify the file hasn't been tampered with before your browser uses it.
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How SRI Protects SVG Loading
Subresource Integrity lets you specify a cryptographic hash of an externally-hosted file in the `integrity` attribute — the browser computes the hash of what it actually downloads and refuses to use it if the hashes don't match, protecting against a compromised CDN silently serving a modified (potentially malicious) SVG.
- integrity attribute pins the expected content hash
- Browser verifies downloaded content matches before using it
- Protects against compromised third-party CDN serving altered files
Generating and Applying SRI Hashes
Generate a hash with `openssl dgst -sha384 -binary file.svg | openssl base64 -A`, then apply it as `<img src="..." integrity="sha384-HASH" crossorigin="anonymous">` — note that `crossorigin` is required for SRI to work at all, and any future update to the hosted file requires regenerating and updating the hash, which is why SRI suits stable, versioned assets best.
- Generate SHA-384 hashes via openssl or online SRI hash tools
- crossorigin attribute is mandatory alongside integrity
- Best suited to stable, versioned third-party assets, not frequently changing ones
Frequently Asked Questions
Do I need SRI for SVGs hosted on my own domain?
No — SRI is meant for third-party resources where you don't control the serving infrastructure. Self-hosted assets on your own domain don't face the same tampering risk from an intermediary CDN or host.
What happens if the hash doesn't match?
The browser blocks the resource from loading entirely and logs a console error — this is intentional fail-safe behavior, so ensure your hash is correct and updated whenever the source file legitimately changes.
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