A vulnerability was discovered in express-xss-sanitizer that allowed unbounded recursion depth during sanitization of nested objects.
The sanitize function in lib/sanitize.js performed recursive sanitization without depth limiting, making it vulnerable to stack overflow attacks via specially crafted deeply nested JSON objects.
An attacker could cause denial-of-service by sending a request with deeply nested structures, potentially crashing the Node.js process.
Upgrade to version 2.0.1 or later:
npm install express-xss-sanitizer@latest
{
"cwe_ids": [
"CWE-674"
],
"github_reviewed": true,
"severity": "MODERATE",
"github_reviewed_at": "2025-09-26T14:38:13Z",
"nvd_published_at": null
}