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CVE-2026-31899

HIGH CVSS 3.1: 7.5 EPSS 0.04%
Updated Mar 18, 2026
Courtbouillon
Parameter Value
CVSS 7.5 (HIGH)
Affected Versions before 2.9.0
Fixed In 2.9.0
Type CWE-674
Vendor Courtbouillon
Public PoC No

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.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Weakness Type (CWE)

Vulnerable Products 1

Configuration From (including) Up to (excluding)
Courtbouillon Cairosvg
cpe:2.3:a:courtbouillon:cairosvg:*:*:*:*:*:*:*:*
2.9.0