CVE-2025-59364: express-xss-sanitizer has an unbounded recursion depth

September 15, 2025

The express-xss-sanitizer (aka Express XSS Sanitizer) package through 2.0.0 for Node.js has an unbounded recursion depth in sanitize in lib/sanitize.js for a JSON request body.

References

gist.github.com/Spendroslav/177804eaef5acfb222a550de212a1b94
github.com/AhmedAdelFahim/express-xss-sanitizer
github.com/advisories/GHSA-qhwp-454g-2gv4
nvd.nist.gov/vuln/detail/CVE-2025-59364
www.npmjs.com/package/express-xss-sanitizer

Code Behaviors & Features

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