High severityNVD Advisory· Published Jun 27, 2022· Updated Apr 23, 2025
Improper handling of CSS at-rules in lettersanitizer
CVE-2022-31103
Description
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, therefore everyone using react-letter is also at risk. The problem has been patched in version 1.0.2.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
lettersanitizernpm | < 1.0.2 | 1.0.2 |
Affected products
2- Range: < 1.0.2
Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-7r3r-gq8p-v9jjghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2022-31103ghsaADVISORY
- github.com/mat-sz/lettersanitizer/commit/96d3dfe2ef0465d47324ed4d13e91ba0816a173fghsax_refsource_MISCWEB
- github.com/mat-sz/lettersanitizer/security/advisories/GHSA-7r3r-gq8p-v9jjghsax_refsource_CONFIRMWEB
- github.com/mat-sz/react-letter/issues/17ghsax_refsource_MISCWEB
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