GHSA-87hq-q4gp-9wr4 is a high-severity (CVSS 7.1) Cross-site Scripting (XSS) vulnerability in react-pdf. A fix is available for react-pdf — see the affected versions and patch details below.
react-pdf vulnerable to arbitrary JavaScript execution upon opening a malicious PDF with PDF.js
Exploitation Status
No confirmed exploitation observed yet
- A successful exploit gives an attacker total control of the affected component, not partial access.
- 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-87hq-q4gp-9wr4.
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-87hq-q4gp-9wr4 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.
react-pdfnpmDescription
Summary
If PDF.js is used to load a malicious PDF, and PDF.js is configured with isEvalSupported set to true (which is the default value), unrestricted attacker-controlled JavaScript will be executed in the context of the hosting domain.
Patches
This patch forces isEvalSupported to false, removing the attack vector.
Workarounds
Set options.isEvalSupported to false, where options is Document component prop.
References
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | react-pdf | all versions | 7.7.3npm install react-pdf@7.7.3 |
| 📦npm | react-pdf | ≥ 8.0.0&&< 8.0.2 | 8.0.2npm install react-pdf@8.0.2 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for react-pdf, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update react-pdf to 7.7.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-87hq-q4gp-9wr4 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-87hq-q4gp-9wr4 can be triaged on real exposure rather than presence alone.
Tailored to GHSA-87hq-q4gp-9wr4. 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-87hq-q4gp-9wr4 in your dependencies?
O3 Security finds GHSA-87hq-q4gp-9wr4 across npm dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.