DiceBear up to 9.3.x SVG ensureSize allocation of resources

Summaryinfo

A vulnerability has been found in DiceBear up to 9.3.x and classified as problematic. Affected by this issue is the function ensureSize of the component SVG Handler. The manipulation leads to allocation of resources. This vulnerability is listed as CVE-2026-29112. The attack may be initiated remotely. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in DiceBear up to 9.3.x and classified as problematic. This issue affects the function ensureSize of the component SVG Handler. The manipulation with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. Impacted is availability. The summary by CVE is:

DiceBear is an avatar library for designers and developers. Prior to version 9.4.0, the `ensureSize()` function in `@dicebear/converter` read the `width` and `height` attributes from the input SVG to determine the output canvas size for rasterization (PNG, JPEG, WebP, AVIF). An attacker who can supply a crafted SVG with extremely large dimensions (e.g. `width="999999999"`) could force the server to allocate excessive memory, leading to denial of service. This primarily affects server-side applications that pass untrusted or user-supplied SVGs to the converter's `toPng()`, `toJpeg()`, `toWebp()`, or `toAvif()` functions. Applications that only convert self-generated DiceBear avatars are not practically exploitable, but are still recommended to upgrade. This is fixed in version 9.4.0. The `ensureSize()` function no longer reads SVG attributes to determine output size. Instead, a new `size` option (default: 512, max: 2048) controls the output dimensions. Invalid values (NaN, negative, zero, Infinity) fall back to the default. If upgrading is not immediately possible, validate and sanitize the `width` and `height` attributes of any untrusted SVG input before passing it to the converter.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-29112 since 03/03/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 9.4.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 42a59eac46a3c68598859e608ec45e578b27614a is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• DiceBear

Version

• 9.0
• 9.1
• 9.2
• 9.3

License

• open-source

Website

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

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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