AIKIDO-2026-866435
inline-style-parser is vulnerable to Regular Expression Denial of Service (ReDoS)
60
Medium Risk
This Affects:
inline-style-parserTL;DR
inline-style-parser strips CSS comments from declaration properties and values with a regular expression built from nested quantifiers and ambiguous alternation. When the parser processes an inline style string containing a crafted comment sequence, the regex engine enters catastrophic backtracking and blocks the single-threaded event loop. An application that parses untrusted CSS or inline style strings can be forced into a denial-of-service state by a short malicious input. The fix rewrites the comment-stripping regular expression into an unambiguous, linear-time pattern.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your application parses untrusted CSS or inline style strings.
Background info
inline-style-parser is vulnerable to Regular Expression Denial of Service (ReDoS) in versions 0.1.0 - 0.2.8.
How to fix this
Upgrade the inline-style-parser library to the patch version.
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