AIKIDO-2026-212791
SixLabors.Fonts is vulnerable to Denial of Service (DoS)
41
Medium Risk
This Affects:
SixLabors.FontsTL;DR
SixLabors.Fonts flattens COLR v1 color-glyph paint graphs by walking paint nodes recursively without tracking already-visited nodes or bounding nesting depth and edge count. A malformed font whose paint graph contains cycles or deep nesting drives unbounded recursion into stack exhaustion, while a highly branching graph fans out into unbounded work. Resolving color glyphs from such a font crashes or hangs the calling process. The fix adds active-path cycle tracking, a maximum nesting depth and edge budget, and safe empty-paint fallbacks.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you process untrusted or externally supplied fonts that contain COLR v1 color-glyph tables.
Background info
SixLabors.Fonts is vulnerable to Denial of Service (DoS) in versions 3.1.0 - 3.1.0.
How to fix this
Upgrade the SixLabors.Fonts library to the patch version.
Are You Affected?
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SOC 2Compliant
ISO 27001CompliantISO 42001Compliant
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