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Vulnerability · Published Oct 8, 2026 · Assigned by GitHub_M

CVE-2026-107378CairoSVG: Quadratic-time DoS parsing a crafted SVG <path>

High 8.7

In plain English

A high-severity security flaw in CairoSVG from Kozea. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.7High
Exploit odds (30 days)0.4%top 67.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

CairoSVG is an SVG converter based on Cairo, a 2D graphics library. Prior to 2.9.1, rendering an attacker-controlled SVG with a path containing many segments can cause quadratic CPU consumption in cairosvg/path.py. The path tokenizer repeatedly slices and rescans the remaining path data, while draw_markers drains node.vertices with node.vertices.pop(0), causing repeated linear-time work. The svg2png, svg2pdf, and svg2ps APIs reach these operations during ordinary rendering, allowing a sub-megabyte SVG to consume substantial CPU and deny service to a rendering application. This issue is fixed in version 2.9.1.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12cairosvgno fix listedDEBIAN-CVE-2026-107378
Debian:13cairosvgno fix listedDEBIAN-CVE-2026-107378
Debian:14cairosvg2.9.1-1DEBIAN-CVE-2026-107378
PyPIcairosvg2.9.1PYSEC-2026-4204
PyPIcairosvg2.9.1GHSA-c3jg-qh8m-j3h2
Ubuntu:22.04:LTScairosvgno fix listedUBUNTU-CVE-2026-107378
Ubuntu:24.04:LTScairosvgno fix listedUBUNTU-CVE-2026-107378

Affected products (as reported)

VendorProductVersions
Kozea CairoSVG < 2.9.1

Weakness: CWE-407 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References