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SVG documentation has an explicit requirement that _consumers_ of path arc commands accept and *correct* certain bad values. This includes using the absolute value of the arc command's rx and ry radius parameters. See "9.5.1. Out-of-range elliptical arc parameters" https://www.w3.org/TR/SVG/paths.html#PathDataEllipticalArcCommands Lib\fontTools\svgLib\path\parser.py is missing any guard against negative values for rx and ry parameter. Adding an abs() to each value read will implement the SVG specification. A problem was seen here while most programs and browsers handle bad arc commands just fine. A bug report has been registered with Inkscape (!) to protect any other non-SVG compliant programs. See https://gitlab.com/inkscape/inbox/-/issues/6857 for more details.