CVE-2026-31899: Courtbouillon Cairosvg

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

CairoSVG is an SVG converter based on Cairo, a 2D graphics library. Prior to Kozea/CairoSVG has exponential denial of service via recursive <use> element amplification in cairosvg/defs.py. This causes CPU exhaustion from a small input.

Affected products

• Courtbouillon Cairosvg: before 2.9.0 (fixed in 2.9.0)

Published 2026-03-13. Last modified 2026-06-17.