AIKIDO-2026-630940
fonttools is vulnerable to Denial of Service (DoS)
50
Medium Risk
This Affects:
fonttoolsTL;DR
fontTools.ttLib.tables._c_m_a_p decompiles cmap subtable character ranges without bounding how far a group can expand. A crafted font with an oversized or malformed cmap group range forces fontTools to allocate memory far beyond the actual character count, exhausting available memory and crashing or hanging the process. The fix bounds cmap group expansion before the allocation happens.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
fonttools is vulnerable to Denial of Service (DoS) in versions 2.3 - 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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