Advisory Weakness Curation

Improper handling of CSS at-rules in lettersanitizer ### Impact 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. ### Patches The problem has been patched in version 1.0.2. ### Workarounds There is no workaround besides upgrading. ### References The issue was originally reported in the react-letter repository: https://github.com/mat-sz/react-letter/issues/17 ### For more information If you have any questions or comments about this advisory: * Open an issue in lettersanitizer https://github.com/mat-sz/lettersanitizer/issues * Email me at [contact@matsz.dev](mailto:contact@matsz.dev)

Improper Check for Unusual or Exceptional Conditions 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.

Duplicate This advisory duplicates another.