GHSA-997g-27x8-43rf is a high-severity (CVSS 8.2) Cross-site Scripting (XSS) vulnerability in @tanstack/react-query-next-experimental. A fix is available for @tanstack/react-query-next-experimental — see the affected versions and patch details below.
react-query-streamed-hydration Cross-site Scripting vulnerability
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-997g-27x8-43rf.
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-997g-27x8-43rf 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 379,842 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.
@tanstack/react-query-next-experimentalnpmDescription
Impact
The @tanstack/react-query-next-experimental NPM package is vulnerable to a cross-site scripting vulnerability. To exploit this, an attacker would need to either inject malicious input or arrange to have malicious input be returned from an endpoint.
This vulnerability arises from improper handling of untrusted input when @tanstack/react-query-next-experimental performs server-side rendering of HTML pages. To fix this vulnerability, we implemented appropriate escaping to prevent javascript injection into rendered pages.
Patches
To fix this issue, please update to version 5.18.0 or later.
Workarounds
There are no known workarounds for this issue. Please update to version 5.18.0 or later.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | @tanstack/react-query-next-experimental | ≥ 5.0.0&&< 5.18.0 | 5.18.0npm install @tanstack/react-query-next-experimental@5.18.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @tanstack/react-query-next-experimental, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update @tanstack/react-query-next-experimental to 5.18.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-997g-27x8-43rf is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-997g-27x8-43rf can be triaged on real exposure rather than presence alone.
Tailored to GHSA-997g-27x8-43rf. 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-997g-27x8-43rf in your dependencies?
O3 Security finds GHSA-997g-27x8-43rf across npm dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.