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Vulnerabilities CVE-2026-26278

CVE-2026-26278

High
Open
TLP:CLEAR

fast-xml-parser affected by DoS through entity expansion in DOCTYPE (no expansion limit)

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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. In versions 4.1.3 through 5.3.5, the XML parser can be forced to do an unlimited amount of entity expansion. With a very small XML input, it’s possible to make the parser spend seconds or even minutes processing a single request, effectively freezing the application. Version 5.3.6 fixes the issue. As a workaround, avoid using DOCTYPE parsing by `processEntities: false` option.

Details

CVSS Score
7.5
EPSS Score
0.84%

54.6th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Confidence
90%
Published
Feb 19, 2026
Last Modified
Aug 11, 2026
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