id: PYSEC-2026-2122
published: "2026-03-13T19:54:38.190Z"
modified: "2026-07-13T05:48:09.161962Z"
aliases:
- CVE-2026-31899
- GHSA-f38f-5xpm-9r7c
details: 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.
affected:
- package:
    name: cairosvg
    ecosystem: PyPI
    purl: pkg:pypi/cairosvg
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: "0"
    - fixed: 2.9.0
  versions:
  - "0.1"
  - 0.1.1
  - 0.1.2
  - "0.2"
  - "0.3"
  - 0.3.1
  - "0.4"
  - 0.4.1
  - 0.4.2
  - 0.4.3
  - 0.4.4
  - "0.5"
  - "1.0"
  - 1.0.1
  - 1.0.10
  - 1.0.11
  - 1.0.12
  - 1.0.13
  - 1.0.14
  - 1.0.15
  - 1.0.16
  - 1.0.17
  - 1.0.18
  - 1.0.19
  - 1.0.2
  - 1.0.20
  - 1.0.21
  - 1.0.22
  - 1.0.3
  - 1.0.4
  - 1.0.5
  - 1.0.6
  - 1.0.7
  - 1.0.8
  - 1.0.9
  - 2.0.0
  - 2.0.0rc1
  - 2.0.0rc2
  - 2.0.0rc3
  - 2.0.0rc4
  - 2.0.0rc5
  - 2.0.0rc6
  - 2.0.1
  - 2.0.2
  - 2.0.3
  - 2.1.0
  - 2.1.1
  - 2.1.2
  - 2.1.3
  - 2.2.0
  - 2.2.1
  - 2.3.0
  - 2.3.1
  - 2.4.0
  - 2.4.1
  - 2.4.2
  - 2.5.0
  - 2.5.1
  - 2.5.2
  - 2.6.0
  - 2.7.0
  - 2.7.1
  - 2.8.0
  - 2.8.1
  - 2.8.2
  ecosystem_specific: {}
references:
- type: FIX
  url: https://github.com/Kozea/CairoSVG/commit/6dde8685ed3f19837767bce7a13a5491e3d0e0bf
- type: EVIDENCE
  url: https://github.com/Kozea/CairoSVG/security/advisories/GHSA-f38f-5xpm-9r7c
severity:
- type: CVSS_V3
  score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H