CVE-2026-31899— CairoSVG vulnerable to Exponential DoS via recursive <use> element amplification
Quick assessment
Affected
Kozea CairoSVG
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
CairoSVG是Kozea开源的一个SVG格式转换工具。 CairoSVG存在安全漏洞，该漏洞源于递归<use>元素放大，可能导致指数级拒绝服务，造成CPU耗尽。
Possible ATT&CK Techniques 1 AI
T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-31899
Vulnerability Information
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Vulnerability Title
CairoSVG vulnerable to Exponential DoS via recursive <use> element amplification
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5
Vulnerability Title
CairoSVG 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CairoSVG是Kozea开源的一个SVG格式转换工具。 CairoSVG存在安全漏洞，该漏洞源于递归<use>元素放大，可能导致指数级拒绝服务，造成CPU耗尽。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-31899
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Qwen3.6-35B-A3B
· 9820 chars
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III. Intelligence Information for CVE-2026-31899
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Patches & Fixes for CVE-2026-31899 (1)
Vendor Advisories for CVE-2026-31899 (1)
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V. Comments for CVE-2026-31899
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