Uncontrolled memory allocation via crafted SVG dimensions in @dicebear/converterGHSA-v3r3-4qgc-vw66
HIGHFix: dicebear/dicebear@42a59eaGHSA-v3r3-4qgc-vw66 is a high-severity (CVSS 7.5) CWE-770 vulnerability in @dicebear/converter. A fix is available for @dicebear/converter — see the affected versions and patch details below.
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for GHSA-v3r3-4qgc-vw66.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.
@dicebear/converternpmDescription
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.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | @dicebear/converter | all versions | 9.4.0npm install @dicebear/converter@9.4.0 |
Affected Products
dicebeardicebearDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @dicebear/converter, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update @dicebear/converter to 9.4.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-v3r3-4qgc-vw66 is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.
Frequently Asked Questions
Is GHSA-v3r3-4qgc-vw66 in your dependencies?
Find it across npm, including transitive dependencies.