VULNERABILITY INTELLIGENCE

CVE-2026-26278

CVSS score7.5 HIGH
EPSS probability0.94%
CISA KEVNot currently listed
Published2026-02-19
Last modified2026-09-10
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Weakness classification

  • security-advisories@github.com: CWE-776
  • 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-776

Primary references