p PatchFirst

CVE-2026-26278

CVE-2026-26278 · fast-xml-parser affected by DoS through entity expansion in DOCTYPE (no expansion limit)

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 7.5 · High · EPSS 0.9% · Fix available

Published
Updated

Stack: system · node

Affected products and versions

  • fast-xml-parser

    Versions
    • >= 5.0.0, < 5.3.6: Affected
    • >= 4.1.3, < 4.5.4: Affected

    No fix published

  • node-webfont Debian:12

    Versions
    • 11.4.0+dfsg2+~cs35.7.26-10
    • 11.4.0+dfsg2+~cs35.7.26-11
    • 11.4.0+dfsg2+~cs35.7.26-12
    • 11.4.0+dfsg2+~cs35.7.26-13
    • 11.4.0+dfsg2+~cs35.7.26-14
    • 11.4.0+dfsg2+~cs35.7.26-15
    • 11.4.0+dfsg2+~cs35.7.26-16
    • 11.4.0+dfsg2+~cs35.7.26-18
    • 11.4.0+dfsg2+~cs35.7.26-19
    • 11.4.0+dfsg2+~cs35.7.26-20
    • 11.4.0+dfsg2+~cs35.7.26-21
    • 11.4.0+dfsg2+~cs35.7.26-7
    • 11.4.0+dfsg2+~cs35.7.26-8
    • 11.4.0+dfsg2+~cs35.7.26-9
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-webfont Debian:13

    Versions
    • 11.4.0+dfsg2+~cs35.7.26-13
    • 11.4.0+dfsg2+~cs35.7.26-14
    • 11.4.0+dfsg2+~cs35.7.26-15
    • 11.4.0+dfsg2+~cs35.7.26-16
    • 11.4.0+dfsg2+~cs35.7.26-18
    • 11.4.0+dfsg2+~cs35.7.26-19
    • 11.4.0+dfsg2+~cs35.7.26-20
    • 11.4.0+dfsg2+~cs35.7.26-21
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-webfont Debian:14

    Versions
    • 11.4.0+dfsg2+~cs35.7.26-13
    • 11.4.0+dfsg2+~cs35.7.26-14
    • 11.4.0+dfsg2+~cs35.7.26-15
    • 11.4.0+dfsg2+~cs35.7.26-16
    • 11.4.0+dfsg2+~cs35.7.26-18
    • 11.4.0+dfsg2+~cs35.7.26-19
    • 11.4.0+dfsg2+~cs35.7.26-20
    • 11.4.0+dfsg2+~cs35.7.26-21
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • fast-xml-parser npm

    Affected ranges
    • SEMVER: ≥ 4.1.3, < 4.5.4

    Update to 4.5.4

  • fast-xml-parser npm

    Affected ranges
    • SEMVER: ≥ 5.0.0, < 5.3.6

    Update to 5.3.6

  • node-webfont Ubuntu:24.04:LTS

    Versions
    • 11.4.0+dfsg2+~cs35.7.26-7ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-webfont Ubuntu:25.10

    Versions
    • 11.4.0+dfsg2+~cs35.7.26-10
    • 11.4.0+dfsg2+~cs35.7.26-13ubuntu2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-webfont Ubuntu:26.10

    Versions
    • 11.4.0+dfsg2+~cs35.7.26-18
    • 11.4.0+dfsg2+~cs35.7.26-19
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-webfont Ubuntu:26.04:LTS

    Versions
    • 11.4.0+dfsg2+~cs35.7.26-13ubuntu2
    • 11.4.0+dfsg2+~cs35.7.26-14
    • 11.4.0+dfsg2+~cs35.7.26-15
    • 11.4.0+dfsg2+~cs35.7.26-16build1
    • 11.4.0+dfsg2+~cs35.7.26-18
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

Check your server →