CVE-2026-33418 json
@dicebear/converter ensureSize() Vulnerable to SVG Dimension Capping Bypass via XML Comment Injection
published 2026-03-20 7 mo ago modified 2026-06-17 4 mo ago also GHSA-7j2x-32w6-p43p , EUVD-2026-14875
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 32%
- public exploits
- 0
- none known
Summary
DiceBear is an avatar library for designers and developers. Prior to version 9.4.2, the `ensureSize()` function in `@dicebear/converter` used a regex-based approach to rewrite SVG `width`/`height` attributes, capping them at 2048px to prevent denial of service. This size capping could be bypassed by crafting SVG input that causes the regex to match a non-functional occurrence of `<svg` before the actual SVG root element. When the SVG is subsequently rendered via `@resvg/resvg-js` on the Node.js code path, it renders at the attacker-specified dimensions, potentially causing out-of-memory crashes. In version 9.4.2, the regex-based approach has been replaced with XML-aware processing using `fast-xml-parser` to correctly identify and modify the SVG root element's attributes. Additionally, a `fitTo` constraint has been added to the `renderAsync` call as defense-in-depth, ensuring the rendered output is always bounded regardless of SVG content.
Patch / fix
- npm @dicebear/converter 9.4.2
- dicebear dicebear 9.4.2
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.38% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | @dicebear/converter | <9.4.2 |
9.4.2 |
Affected products
- dicebear dicebear
Classification
- Weakness
-
- CWE-185 Incorrect Regular Expression
References
-
github.com
/dicebear/dicebear/security/advisories/GHSA-7j2x-32w6-p43p
web, mitigation, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-33418
advisory
-
github.com
/dicebear/dicebear
package
Sources
- CVE List CVE-2026-33418
- GitHub Advisory GHSA-7j2x-32w6-p43p
- NVD CVE-2026-33418
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