Headline
CVE-2021-33587: Release v5.0.1 · fb55/css-what
The css-what package 4.0.0 through 5.0.0 for Node.js does not ensure that attribute parsing has Linear Time Complexity relative to the size of the input.
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Ubuntu Security Notice 6065-1 - It was discovered that css-what incorrectly handled certain inputs. If a user or an automated system were tricked into opening a specially crafted input file, a remote attacker could possibly use this issue to cause a denial of service.