What is CVE-2026-44664?

CVE-2026-44664 is a medium-severity vulnerability in Naturalintelligence Fast-xml-builder, classified under XML Injection (Blind XPath Injection). CVSS score: 6.1/10. Published 2026-05-13.

How severe is CVE-2026-44664?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XPath Injection in Naturalintelligence Fast-xml-builder

CVE-2026-44664

fast-xml-builder builds XML from JSON. In 1.1.5, the fix for CVE-2026-41650 in fast-xml-parser sanitizes -- sequences in XML comment content using .replace(/--/g, '- -'). This skip the values containing three consecutive dashes (e.g., --->…

EPSS: 0.000 (1.3th 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-builder — versions 1.1.5

Weakness classification (CWE)

CWE-91 — XML Injection (Blind XPath Injection)

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-44664?: CVE-2026-44664 is a medium-severity vulnerability in Naturalintelligence Fast-xml-builder, classified under XML Injection (Blind XPath Injection). CVSS score: 6.1/10. Published 2026-05-13.
How severe is CVE-2026-44664?: Medium severity. CVSS v3 base score is 6.1 out of 10.