express-xss-sanitizer has an unbounded recursion depth
Security Advisory: express-xss-sanitizer
Overview
A vulnerability was discovered in express-xss-sanitizer that allowed unbounded recursion depth during sanitization of nested objects.
Affected Versions
- All versions prior to 2.0.1
Patched Versions
- 2.0.1 and later
Description
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.
Impact
An attacker could cause denial-of-service by sending a request with deeply nested structures, potentially crashing the Node.js process.
Solution
Upgrade to version 2.0.1 or later:
npm install express-xss-sanitizer@latestAffected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | express-xss-sanitizer | < 2.0.1 | 2.0.1 |
References
- https://github.com/AhmedAdelFahim/express-xss-sanitizer/security/advisories/GHSA-hvq2-wf92-j4f3
- https://nvd.nist.gov/vuln/detail/CVE-2025-59364
- https://github.com/AhmedAdelFahim/express-xss-sanitizer/pull/23
- https://github.com/AhmedAdelFahim/express-xss-sanitizer/commit/62d6542a2a57298da7a2e02de623454007e4f6d6
- https://dbugs.ptsecurity.com/vulnerability/PT-2025-37434
- https://gist.github.com/Spendroslav/177804eaef5acfb222a550de212a1b94
- https://github.com/AhmedAdelFahim/express-xss-sanitizer
- https://www.npmjs.com/package/express-xss-sanitizer
- https://www.tenable.com/cve/CVE-2025-59364
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N- Weakness (CWE)
CWE-674- Platform
- npm
- Package
express-xss-sanitizer- Disclosed
- 26.09.2025
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-hvq2-wf92-j4f3 - CC BY 4.0
Vulnerability history: express-xss-sanitizer
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 3
- First → latest
- 09.2022 03.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 1
- Medium 2
Disclosures per year
- 2022: 1
- 2023: 0
- 2024: 0
- 2025: 1
- 2026: 1
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