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.
| Źródło | Link | Uwagi |
|---|---|---|
| NVD (NIST) | https://nvd.nist.gov/vuln/detail/CVE-2026-25896 | Karta CVE w NVD |
| CISA KEV | https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-25896 | Wyszukiwanie CVE w KEV |
| FIRST EPSS | https://api.first.org/data/v1/epss?cve=CVE-2026-25896 | API EPSS dla CVE |
| security-advisories@github.com | https://github.com/NaturalIntelligence/fast-xml-parser/commit/943ef0eb1b2d3284e72dd74f44a042ee9f07026e | Patch |
| security-advisories@github.com | https://github.com/NaturalIntelligence/fast-xml-parser/commit/ddcd0acf26ddd682cb0dc15a2bd6aa3b96bb1e69 | Patch |
| security-advisories@github.com | https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.3.5 | Product, Release Notes |
| security-advisories@github.com | https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-m7jm-9gc2-mpf2 | Exploit, Mitigation, Vendor Advisory |