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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (18.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 18th percentile — 18.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.000
Affected products
- Naturalintelligence Fast-Xml-Parser — versions < 5.7.0
Weakness classification (CWE)
References
- github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-gh4j-gq… (Exploit, Mitigation, Vendor Advisory)
- github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.6.0 (Product, 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.