GHSA-V3R3-4QGC-VW66

Vulnerability from github – Published: 2026-03-16 16:15 – Updated: 2026-03-19 21:00
VLAI?
Summary
Uncontrolled memory allocation via crafted SVG dimensions in @dicebear/converter
Details

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.

Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@dicebear/converter"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9.4.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-29112"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-16T16:15:33Z",
    "nvd_published_at": "2026-03-18T04:17:16Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nThe `ensureSize()` function in `@dicebear/converter` (versions \u003c 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.\n\nThis primarily affects server-side applications that pass **untrusted or user-supplied SVGs** to the converter\u0027s `toPng()`, `toJpeg()`, `toWebp()`, or `toAvif()` functions. Applications that only convert self-generated DiceBear avatars are not practically exploitable, but are still recommended to upgrade.\n\n### Patches\n\nFixed 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.\n\n### Workarounds\n\nIf upgrading is not immediately possible, validate and sanitize the `width` and `height` attributes of any untrusted SVG input before passing it to the converter.",
  "id": "GHSA-v3r3-4qgc-vw66",
  "modified": "2026-03-19T21:00:24Z",
  "published": "2026-03-16T16:15:33Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/dicebear/dicebear/security/advisories/GHSA-v3r3-4qgc-vw66"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-29112"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dicebear/dicebear/commit/42a59eac46a3c68598859e608ec45e578b27614a"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/dicebear/dicebear"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dicebear/dicebear/releases/tag/v9.4.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Uncontrolled memory allocation via crafted SVG dimensions in @dicebear/converter"
}


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