AIKIDO-2026-390308
fonttools is vulnerable to Path Traversal
65
Medium Risk
This Affects:
fonttoolsTL;DR
The vendored fontTools.misc.filesystem module builds filesystem paths from names taken directly from UFO sources without checking that they stay inside the intended root. A malicious UFO can use .. components in its contents.plist to read files anywhere on disk, and a crafted .ufoz archive can create files outside its temporary mirror. This yields path traversal with arbitrary file read and file creation when an application processes an untrusted font source. The fix rejects any member path that resolves outside the filesystem root.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your application reads untrusted UFO or .ufoz font sources.
Background info
fonttools is vulnerable to Path Traversal in versions 4.59.0 - 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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