CVE-2026-29074
HIGH
GHSA-xpqw-6gx7-v673
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
4Description
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.
Analysis
Denial of service in SVGO versions 2.1.0-2.8.0, 3.0.0-3.3.2, and before 4.0.1 allows unauthenticated attackers to crash the Node.js process through XML entity expansion attacks, with a minimal 811-byte payload triggering heap exhaustion. Public exploit code exists for this vulnerability, and no patch is currently available. …
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Remediation
Within 24 hours: Identify all internal systems and dependencies using SVGO (versions 2.1.0-2.8.0, 3.0.0-3.3.2, and 4.0.0) through software composition analysis and inventory review. Within 7 days: Implement compensating controls (input validation, request timeouts, rate limiting) on all systems accepting SVG uploads until patches are available; communicate patch timeline to stakeholders. …
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External POC / Exploit Code
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