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.
EPSS: 0.005 (39.4th percentile) — read the EPSS interpretation.
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.
Affected products
- Courtbouillon Cairosvg
- Kozea Cairosvg — versions < 2.9.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
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.