Fluid Attacks Database

Description

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.

Mitigation

Update Impact

Minimal update. May introduce new vulnerabilities or breaking changes.

Ecosystem	Package	Affected version	Patched versions
npm	fast-xml-parser	>=0 <5.7.0	5.7.0
debian 12	node-webfont	=11.4.0+dfsg2+~cs35.7.26-10 \|\| =11.4.0+dfsg2+~cs35.7.26-11 \|\| =11.4.0+dfsg2+~cs35.7.26-12 \|\| =11.4.0+dfsg2+~cs35.7.26-13 \|\| =11.4.0+dfsg2+~cs35.7.26-14 \|\| =11.4.0+dfsg2+~cs35.7.26-15 \|\| =11.4.0+dfsg2+~cs35.7.26-16 \|\| =11.4.0+dfsg2+~cs35.7.26-18 \|\| =11.4.0+dfsg2+~cs35.7.26-19 \|\| =11.4.0+dfsg2+~cs35.7.26-7 \|\| =11.4.0+dfsg2+~cs35.7.26-8 \|\| =11.4.0+dfsg2+~cs35.7.26-9	-
debian 13	node-webfont	=11.4.0+dfsg2+~cs35.7.26-13 \|\| =11.4.0+dfsg2+~cs35.7.26-14 \|\| =11.4.0+dfsg2+~cs35.7.26-15 \|\| =11.4.0+dfsg2+~cs35.7.26-16 \|\| =11.4.0+dfsg2+~cs35.7.26-18 \|\| =11.4.0+dfsg2+~cs35.7.26-19	-
debian 14	node-webfont	=11.4.0+dfsg2+~cs35.7.26-13 \|\| =11.4.0+dfsg2+~cs35.7.26-14 \|\| =11.4.0+dfsg2+~cs35.7.26-15 \|\| =11.4.0+dfsg2+~cs35.7.26-16 \|\| =11.4.0+dfsg2+~cs35.7.26-18 \|\| =11.4.0+dfsg2+~cs35.7.26-19	-

Aliases

1. CVE-2026-416502. NVD-2026-416503. OSV-2026-416504. OSV-DEBIAN-2026-416505. GHSA-gh4j-gqv2-49f66. GCVE-2026-416507. SECURITY-TRACKER-CVE-2026-41650

References

1. https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-gh4j-gqv2-49f62. https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.6.0