GHSA-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.
Uncontrolled memory allocation via crafted SVG dimensions in @dicebear/converter
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
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
GHSA-v3r3-4qgc-vw66 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 377,166 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
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
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 Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | @dicebear/converter | all versions | 9.4.0npm install @dicebear/converter@9.4.0 |
Detection & 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
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-v3r3-4qgc-vw66 can be triaged on real exposure rather than presence alone.
Tailored to GHSA-v3r3-4qgc-vw66. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-v3r3-4qgc-vw66 in your dependencies?
O3 Security finds GHSA-v3r3-4qgc-vw66 across npm dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.