lettersanitizer is a DOM-based HTML email sanitizer for in-browser email rendering. All versions of lettersanitizer below 1.0.2 are affected by a denial of service issue when processing a CSS at-rule `@keyframes`. This package is depended on by [react-letter](https://github.com/mat-sz/react-letter), therefore everyone using react-letter is also at risk. The problem has been patched in version 1.0.2.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| lettersanitizer(npm) | 0 | 1.0.2 | N/A |
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