XPath Injection in Naturalintelligence Fast-Xml-Parser
CVE-2026-41650
fast-xml-parser allows users to process XML from JS object without C/C++ based libraries or callbacks. Prior to version 5.7.0, XMLBuilder does not escape the "-->" sequence in comment content or the "]]>" sequence in CDATA sections when building XML from JavaScript objects. This allows XML injection when user-controlled data flows into comments or CDATA elements, leading to XSS, SOAP injection, or data manipulation. This issue has been patched in version 5.7.0.
EPSS: 0.002 (14.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
Affected products
- Naturalintelligence Fast-xml-parser — versions < 5.7.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)
- security-advisories@github.com (Product, x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-41650?
- CVE-2026-41650 is a medium-severity vulnerability in Naturalintelligence Fast-Xml-Parser, classified under XML Injection (Blind XPath Injection). CVSS score: 6.1/10. Published 2026-05-07.
- How severe is CVE-2026-41650?
- Medium severity. CVSS v3 base score is 6.1 out of 10.