CVE-2026-29112 @dicebear/converter vulnerable to ncontrolled memory allocation via crafted SVG dimensions
An attacker can cause denial of service by supplying crafted SVGs with excessive dimensions to the DiceBear converter, forcing excessive memory allocation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-29112?
CVE-2026-29112 is a high-severity denial of service vulnerability in dicebear, published on 18 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-770
Which versions are affected by CVE-2026-29112?
2 open source packages ship an affected version, including @dicebear/converter. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
@dicebear/converter npm | All versions | 9.4.0 |
@dicebear/converter npm | All versions | 9.4.0 |
Products include Dicebear Dicebear.
How do I fix CVE-2026-29112?
Upgrade @dicebear/converter to 9.4.0 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-29112 being exploited?
There is no known exploitation of CVE-2026-29112 in the wild and no public exploit code.
Other vulnerabilities in dicebear
Sources
Also known as GHSA-v3r3-4qgc-vw66.