CVE-2021-21236mediumCWE-400

CVE-2021-21236: medium-severity vulnerability in Kozea CairoSVG

Regular Expression Denial of Service in CairoSVG

Published · Updated

Follow this CVE+ Monitor CairoSVG+ Monitor cairosvg

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 5.7epss 1.4%
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
Affected products
Kozea · CairoSVG
Related CVEs — Kozea CairoSVG

In the same product, most dangerous first.

CVE-2023-27586CRITICALCairoSVG improperly processes SVG files loaded from external resourcesEPSS 0.7%CVE-2026-31899HIGHCairoSVG vulnerable to Exponential DoS via recursive <use> element amplificationEPSS 0.6%CVE-2026-107378HIGHCairoSVG: Quadratic-time DoS parsing a crafted SVG <path>EPSS 0.4%