Tool Lets Developers Detect Regex Denial-of-Service Vulnerabilities Before Deployment

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A developer has released ReDoScan, a free web checker and REST API designed to identify regular expressions vulnerable to catastrophic backtracking before they reach production. Catastrophic backtracking, classified as CWE-1333 or ReDoS, occurs when certain regex patterns create an exponentially growing search space on crafted non-matching inputs, pinning CPU usage at 100%. The vulnerability affects all major backtracking-based runtime engines, including Node.js, Python, Java, and Ruby. Common triggers include nested quantifiers, overlapping alternation, and prefix overlap — patterns that frequently appear in real-world validators. The tool offers static analysis with a five-level risk rating and integrates with CI/CD pipelines via a RapidAPI-hosted endpoint, with a free tier allowing 1,500 scans per month.

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