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CVE-2026-29074— SVGO: DoS through entity expansion in DOCTYPE (Billion Laughs)

Quick assessment

Affected
svg svgo
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SVGO是svg开源的一个SVG文件优化工具。 SVGO 2.1.0至2.8.1之前版本、3.0.0至3.3.3之前版本和4.0.1之前版本存在安全漏洞，该漏洞源于处理XML自定义实体时未防范实体扩展，可能导致拒绝服务。

CVSS 7.5 · High EPSS 0.97% · P61

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 3

VendorProduct Version RangeStatus
svg svgo >= 2.1.0, < 2.8.1 affected
>= 3.0.0, < 3.3.3 affected
= 4.0.0 affected
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I. Basic Information for CVE-2026-29074

Vulnerability Information
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Vulnerability Title
SVGO: DoS through entity expansion in DOCTYPE (Billion Laughs)
Source: CVE Program / CVE List V5
Vulnerability Description
SVGO, short for SVG Optimizer, is a Node.js library and command-line application for optimizing SVG files. From version 2.1.0 to before version 2.8.1, from version 3.0.0 to before version 3.3.3, and before version 4.0.1, SVGO accepts XML with custom entities, without guards against entity expansion or recursion. This can result in a small XML file (811 bytes) stalling the application and even crashing the Node.js process with JavaScript heap out of memory. This issue has been patched in versions 2.8.1, 3.3.3, and 4.0.1.
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
DTD中递归实体索引的不恰当限制(XML实体扩展)
Source: CVE Program / CVE List V5
Vulnerability Title
SVGO 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SVGO是svg开源的一个SVG文件优化工具。 SVGO 2.1.0至2.8.1之前版本、3.0.0至3.3.3之前版本和4.0.1之前版本存在安全漏洞，该漏洞源于处理XML自定义实体时未防范实体扩展，可能导致拒绝服务。
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

Vendor Product Affected Versions CPE Subscribe
svg svgo >= 2.1.0, < 2.8.1 -

II. Public POCs for CVE-2026-29074

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III. Intelligence Information for CVE-2026-29074

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Vendor Advisories for CVE-2026-29074 (1)

IV. Related Vulnerabilities

Same product: svgo
Same vendor: svg
Same weakness: CWE-776

V. Comments for CVE-2026-29074

Anonymous User
2026-09-05 07:28:38

1

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