CVE-2022-31103

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.

• CWE-754

• https://github.com/mat-sz/lettersanitizer/commit/96d3dfe2ef0465d47324ed4d13e91ba0816a173fPatch, Third Party Advisory
• https://github.com/mat-sz/lettersanitizer/security/advisories/GHSA-7r3r-gq8p-v9jjThird Party Advisory
• https://github.com/mat-sz/react-letter/issues/17Issue Tracking, Third Party Advisory
• https://github.com/mat-sz/lettersanitizer/commit/96d3dfe2ef0465d47324ed4d13e91ba0816a173fPatch, Third Party Advisory
• https://github.com/mat-sz/lettersanitizer/security/advisories/GHSA-7r3r-gq8p-v9jjThird Party Advisory
• https://github.com/mat-sz/react-letter/issues/17Issue Tracking, Third Party Advisory

Published

Jun 27, 2022

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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