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CVE-2026-25896

CRITICAL

9.3

Description

fast-xml-parser allows users to validate XML, parse XML to JS object, or build XML from JS object without C/C++ based libraries and no callback. From 4.1.3to before 5.3.5, a dot (.) in a DOCTYPE entity name is treated as a regex wildcard during entity replacement, allowing an attacker to shadow built-in XML entities (<, >, &, ", ') with arbitrary values. This bypasses entity encoding and leads to XSS when parsed output is rendered. This vulnerability is fixed in 5.3.5.

Details CVE

Score CVSS v3.19.3

SeveriteCRITICAL

Vecteur CVSSCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N

Vecteur d'attaqueNETWORK

ComplexiteLOW

Privileges requisNONE

Interaction utilisateurNONE

Publie2/20/2026

Derniere modification3/2/2026

Sourcenvd

Observations honeypot0

Produits affectes

naturalintelligence:fast-xml-parser

Faiblesses (CWE)

CWE-185

References

https://github.com/NaturalIntelligence/fast-xml-parser/commit/943ef0eb1b2d3284e72dd74f44a042ee9f07026e(security-advisories@github.com)

https://github.com/NaturalIntelligence/fast-xml-parser/commit/ddcd0acf26ddd682cb0dc15a2bd6aa3b96bb1e69(security-advisories@github.com)

https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.3.5(security-advisories@github.com)

https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-m7jm-9gc2-mpf2(security-advisories@github.com)

Correlations IOC

Aucune correlation enregistree

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