CVE-2026-33311 — @dicebear/core
MEDIUMCVE-2026-33311 is a medium-severity (CVSS 4.7) Cross-site Scripting (XSS) vulnerability in @dicebear/core. A fix is available for @dicebear/core — see the affected versions and patch details below.
@dicebear/core and @dicebear/initials Vulnerable to SVG Injection via Unsanitized Options
Exploitation Status
No confirmed exploitation observed yet
- 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 CVE-2026-33311.
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
CVE-2026-33311 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 377,636 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/corenpmDescription
Summary
SVG attribute values derived from user-supplied options (backgroundColor, fontFamily, textColor) were not XML-escaped before interpolation into SVG output. This could allow Cross-Site Scripting (XSS) when applications pass untrusted input to createAvatar() and serve the resulting SVG inline or with Content-Type: image/svg+xml.
Affected packages
@dicebear/core—backgroundColoroption values interpolated into SVG attributes without escaping (affectssolidandgradientLinearbackground types)@dicebear/initials—fontFamilyandtextColoroption values interpolated into SVG attributes without escaping
Fix
All affected SVG attribute values are now properly escaped using XML entity encoding. Users should upgrade to the listed patched versions.
Mitigating factors
- Applications that validate input against the library's JSON Schema before passing it to
createAvatar()are not affected - The DiceBear CLI validates input via AJV and was not vulnerable
- Exploitation requires that an application passes untrusted, unvalidated external input directly as option values
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | @dicebear/core | ≥ 5.0.0&&< 5.4.4 | 5.4.4npm install @dicebear/core@5.4.4 |
| 📦npm | @dicebear/core | ≥ 6.0.0&&< 6.1.4 | 6.1.4npm install @dicebear/core@6.1.4 |
| 📦npm | @dicebear/core | ≥ 7.0.0&&< 7.1.4 | 7.1.4npm install @dicebear/core@7.1.4 |
| 📦npm | @dicebear/core | ≥ 8.0.0&&< 8.0.3 | 8.0.3npm install @dicebear/core@8.0.3 |
| 📦npm | @dicebear/core | ≥ 9.0.0&&< 9.4.1 | 9.4.1npm install @dicebear/core@9.4.1 |
| 📦npm | @dicebear/initials | ≥ 5.0.0&&< 5.4.4 | 5.4.4npm install @dicebear/initials@5.4.4 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @dicebear/core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update @dicebear/core to 5.4.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-33311 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 CVE-2026-33311 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2026-33311. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2026-33311 in your dependencies?
O3 Security finds CVE-2026-33311 across npm dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.