Vulnerability in Courtbouillon Cairosvg
CVE-2026-31899
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (41.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 41.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000
Affected products
- Courtbouillon Cairosvg
- Kozea Cairosvg — versions < 2.9.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/Kozea/CairoSVG/security/advisories/GHSA-f38f-5xpm-9r7c (Exploit, Mitigation, Vendor Advisory)
- github.com/Kozea/CairoSVG/commit/6dde8685ed3f19837767bce7a13a5491e3d0e0bf (Patch)
Frequently asked questions
- What is CVE-2026-31899?
- CVE-2026-31899 is a high-severity vulnerability in Courtbouillon Cairosvg, classified under Uncontrolled Recursion. CVSS score: 7.5/10. Published 2026-03-13.
- How severe is CVE-2026-31899?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2026-31899 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.