CVE-2026-33418

CVE-2026-33418 · @dicebear/converter ensureSize() Vulnerable to SVG Dimension Capping Bypass via XML Comment Injection

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DiceBear is an avatar library for designers and developers. Prior to version 9.4.2, the `ensureSize()` function in `@dicebear/converter` used a regex-based approach to rewrite SVG `width`/`height` attributes, capping them at 2048px to prevent denial of service. This size capping could be bypassed by crafting SVG input that causes the regex to match a non-functional occurrence of `<svg` before the actual SVG root element. When the SVG is subsequently rendered via `@resvg/resvg-js` on the Node.js code path, it renders at the attacker-specified dimensions, potentially causing out-of-memory crashes. In version 9.4.2, the regex-based approach has been replaced with XML-aware processing using `fast-xml-parser` to correctly identify and modify the SVG root element's attributes. Additionally, a `fitTo` constraint has been added to the `renderAsync` call as defense-in-depth, ensuring the rendered output is always bounded regardless of SVG content.

CVSS 7.5 · Élevée · EPSS 0,4% · Correctif disponible

Publication

2026-03-24T13:25:57.540Z

Mise à jour

2026-03-24T15:11:51.489Z

Pile logicielle: node

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