Detections
Analytics
CVE-2026-25896
high
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.
References
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25896.json
https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-m7jm-9gc2-mpf2
https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.3.5
https://bugzilla.redhat.com/show_bug.cgi?id=2441501
https://access.redhat.com/security/cve/CVE-2026-25896
https://access.redhat.com/errata/RHSA-2026:7128
https://access.redhat.com/errata/RHSA-2026:7110
https://access.redhat.com/errata/RHSA-2026:6802
https://access.redhat.com/errata/RHSA-2026:6174
https://access.redhat.com/errata/RHSA-2026:41944