Bug 2441501 (CVE-2026-25896) - CVE-2026-25896 fast-xml-parser: fast-xml-parser: Cross-Site Scripting (XSS) due to improper DOCTYPE entity handling
Summary: CVE-2026-25896 fast-xml-parser: fast-xml-parser: Cross-Site Scripting (XSS) d...
Keywords:
Status: NEW
Alias: CVE-2026-25896
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2441504 2441505
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-02-20 22:02 UTC by OSIDB Bzimport
Modified: 2026-02-20 22:57 UTC (History)
43 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:


Attachments (Terms of Use)

Description OSIDB Bzimport 2026-02-20 22:02:23 UTC
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.


Note You need to log in before you can comment on or make changes to this bug.