What’s Vulnerable › Vulnerabilities

CVE-2026-31899: CairoSVG vulnerable to Exponential DoS via recursive <use> element amplification

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-13 · updated 2026-06-17
• Weakness: CWE-674

Description

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

• Kozea CairoSVG: before 2.9.0 — fixed in 2.9.0

How to fix

Upgrade to a fixed version: Kozea CairoSVG 2.9.0. Check the vendor advisory for mitigations.

References

• https://github.com/Kozea/CairoSVG/commit/6dde8685ed3f19837767bce7a13a5491e3d0e0bf
• https://github.com/Kozea/CairoSVG/security/advisories/GHSA-f38f-5xpm-9r7c

Get alerted when CVE-2026-31899 or the next vulnerability affects your stack