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CVE-2026-31899

HighPublished

CairoSVG vulnerable to Exponential DoS via recursive element amplification

Published: Mar 13, 2026
Updated: Mar 16, 2026
Assigning CNA: GitHub_M
Evidence observed: Aug 28, 2026

Primary CVSS

7.5/ 10High

nvd · CVSS 3.1

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

EPSS probability estimate

0.5%

Low · next 30 days

Percentile: 41.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-31899PoC
CVE-2026-31899: Exponential DoS via Recursive <use> Element Amplification in CairoSVG (CVSS 7.5 High)

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