Inefficient Algorithmic Complexity in CairoSVG - CVE-2026-107378
Published: November 11, 2026
Vulnerability identifier: #VU165871
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-107378
CWE-ID: CWE-407
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service through excessive CPU consumption in services rendering untrusted SVG documents.
The vulnerability exists due to quadratic-time processing in cairosvg/path.py when tokenizing path data by repeatedly slicing and rescanning the remaining string and draining marker vertices using list.pop(0). A remote attacker can submit a crafted SVG containing a path with many segments for rendering through svg2png, svg2pdf, or svg2ps to exhaust CPU resources and degrade service availability.
Affected software
CairoSVG
How to mitigate CVE-2026-107378
Install security update from vendor's website.
CairoSVG - update to 2.9.1