XML Entity Expansion (Billion Laughs) Affecting svgo package, versions >=2.1.0 <2.8.1>=3.0.0 <3.3.3>=4.0.0 <4.0.1
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-SVGO-15423912
- published5 Mar 2026
- disclosed4 Mar 2026
- creditByambadalai Sumiya
Introduced: 4 Mar 2026
NewCVE-2026-29074 (opens in a new tab)How to fix?
Upgrade svgo to version 2.8.1, 3.3.3, 4.0.1 or higher.
Overview
Affected versions of this package are vulnerable to XML Entity Expansion (Billion Laughs) when parsing of custom XML entities in DOCTYPE. An attacker can cause the application to consume excessive memory by submitting malicious SVG files containing recursive entity references.
Workaround
For version 4.0.0, upgrading the sax dependency to 1.5.0 recursively (yarn -R) mitigates this vulnerability.