AIKIDO-2026-574821
fonttools is vulnerable to XML External Entity (XXE) Injection
58
Medium Risk
This Affects:
fonttoolsTL;DR
fontTools' XML helper (fontTools.misc.etree) builds an lxml parser without disabling external entity resolution or network access. Parsing a crafted TTX, DesignSpace, or other XML-based font-adjacent file that contains an external entity reference lets the parser read local files or fetch network resources and return their contents to the caller. The fix disables entity resolution and network access on the lxml parser used throughout fontTools.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you parse XML-based font or font-adjacent files with the lxml-backed parser.
Background info
fonttools is vulnerable to XML External Entity (XXE) Injection in versions 3.31.0 - 4.65.0.
How to fix this
Upgrade the fonttools library to the patch version.
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SOC 2Compliant
ISO 27001CompliantISO 42001Compliant
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