Uncontrolled memory allocation via crafted SVG dimensions in @dicebear/converter
Impact
The ensureSize() function in @dicebear/converter (versions < 9.4.0) 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.
Patches
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.
Workarounds
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | @dicebear/converter | < 9.4.0 | 9.4.0 |
References
- https://github.com/dicebear/dicebear/security/advisories/GHSA-v3r3-4qgc-vw66
- https://nvd.nist.gov/vuln/detail/CVE-2026-29112
- https://github.com/dicebear/dicebear/commit/42a59eac46a3c68598859e608ec45e578b27614a
- https://github.com/dicebear/dicebear
- https://github.com/dicebear/dicebear/releases/tag/v9.4.0
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-770- Platform
- npm
- Package
@dicebear/converter- Disclosed
- 16.03.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-v3r3-4qgc-vw66 - CC BY 4.0
Vulnerability history: @dicebear/converter
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 03.2026 03.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 2
Disclosures per year
- 2026: 2
-
Uncontrolled memory allocation via crafted SVG dimensions in @dicebear/converter this entry
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