CVE-2021-21236: Courtbouillon Cairosvg

Medium severity, CVSS 5.5. EPSS: 1.4% chance of exploitation in the next 30 days.

CairoSVG is a Python (pypi) package. CairoSVG is an SVG converter based on Cairo. In CairoSVG before version 2.5.1, there is a regular expression denial of service (REDoS) vulnerability. When processing SVG files, the python package CairoSVG uses two regular expressions which are vulnerable to Regular Expression Denial of Service (REDoS). If an attacker provides a malicious SVG, it can make cairosvg get stuck processing the file for a very long time. This is fixed in version 2.5.1. See Referenced GitHub advisory for more information.

Affected products

• Courtbouillon Cairosvg: before 2.5.1 (fixed in 2.5.1)

Published 2021-01-06. Last modified 2026-06-17.