AIKIDO-2026-853949
fonttools is vulnerable to Path Traversal
55
Medium Risk
This Affects:
fonttoolsTL;DR
When exporting embedded bitmap data to external files, the EBDT/CBDT code uses the glyph name directly as the output filename. A font with crafted glyph names containing path separators can make the exported bitmap escape the output directory, allowing arbitrary file writes outside the intended folder. Untrusted fonts can also collide filenames so that one glyph overwrites another. The fix percent-encodes unsafe glyph names into an injective, path-separator-free filename.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you export embedded bitmaps to external files (for example ttx -z extfile) from untrusted fonts.
Background info
fonttools is vulnerable to Path Traversal in versions 2.5 - 4.63.0.
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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