Vulnerability record · CVE-2026-31899 · published 13 March 2026

CVE-2026-31899: Courtbouillon cairosvg vulnerability

Courtbouillon · Cairosvg

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.

7.5 CVSS 3.1 High EPSS 0.52% · top 58.5% CWE-674 · CWE-674

7.5CVSS 3.1 base score

0.52%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

2References, 1 tagged exploit

17 Jun 2026Last modified by NVD

Description

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Cairosvg Courtbouillon

References

Link	Tags
https://github.com/Kozea/CairoSVG/commit/6dde8685ed3f19837767bce7a13a5491e3d0e0bf	Patch
https://github.com/Kozea/CairoSVG/security/advisories/GHSA-f38f-5xpm-9r7c	ExploitMitigationVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.1CVE-2023-27586Courtbouillon cairosvg improper input validation vulnerabilityCairoSVG is an SVG converter based on Cairo, a 2D graphics library. Prior to version 2.7.0, Cairo can send requests to external hosts when processing…EPSS 0.72%20 Mar 2023 5.5CVE-2021-21236Courtbouillon cairosvg uncontrolled resource consumption vulnerabilityCairoSVG 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 den…EPSS 1.5%6 Jan 2021

Source: NIST National Vulnerability Database (record CVE-2026-31899), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.