CVE-2026-29112

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.

• CWE-770

• https://github.com/dicebear/dicebear/commit/42a59eac46a3c68598859e608ec45e578b27614aPatch
• https://github.com/dicebear/dicebear/releases/tag/v9.4.0Product, Release Notes
• https://github.com/dicebear/dicebear/security/advisories/GHSA-v3r3-4qgc-vw66Mitigation, Vendor Advisory

Published

Mar 18, 2026

Last Modified

Jun 17, 2026

Status

Analyzed