Summaryinfo

A vulnerability classified as problematic has been found in DiceBear up to 9.4.1. Affected by this issue is the function ensureSize of the component SVG Handler. This manipulation of the argument width/height causes incorrect regex. This vulnerability is handled as CVE-2026-33418. The attack can be initiated remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in DiceBear up to 9.4.1. It has been declared as problematic. Affected by this vulnerability is the function ensureSize of the component SVG Handler. The manipulation of the argument width/height with an unknown input leads to a incorrect regex vulnerability. The CWE definition for the vulnerability is CWE-185. The product specifies a regular expression in a way that causes data to be improperly matched or compared. As an impact it is known to affect availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-33418 since 03/19/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 9.4.2 eliminates this vulnerability.

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Productinfo

Name

• DiceBear

Version

• 9.4.0
• 9.4.1

Website

• Product: https://github.com/dicebear/dicebear/

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