GHSA-hxcr-hm88-mpq6 is a high-severity (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in nuxt. A fix is available for nuxt — see the affected versions and patch details below.
Nuxt: Unauthenticated out-of-memory crash via unbounded v-for expansion in island rendering
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-hxcr-hm88-mpq6.
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-hxcr-hm88-mpq6 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.
nuxtnpmDescription
Impact
An unauthenticated attacker can crash a Nuxt server that renders any island / server component containing a v-for over a prop (for example v-for="n in count" or a <slot v-for>). Because the island URL hash is a non-secret digest of the request, the attacker can compute a valid hash for arbitrary props and send the iterated prop as a large integer. The server then expands the v-for to that many nodes during SSR, allocating memory proportional to the attacker's number. Reporter figures: count=8000000 produced a 142.9 MB response; count=40000000 (and items=4000000 on a slot list) produced an out-of-memory crash of the worker from a single ~130-byte request. Both the plain v-for path (Vue's ssrRenderList) and the slot path (vforToArray) are affected.
Patches
Fixed in [email protected] and [email protected]. Island/server-component v-for sources are now clamped to a maximum iteration count (MAX_VFOR_LENGTH = 100000) at the render boundary, covering the plain path, the <slot v-for> element, and the vforToArray slot-props helper. Combined with the body-size cap (GHSA-9pgf-384g-p7mv), a single island render can no longer allocate without bound regardless of which v-for path is used or whether the prop arrives as an integer or an array.
Workarounds
Avoid v-for directly over an unclamped prop in server components, or clamp the count in the component (v-for="n in Math.min(count, 1000)"). A body-size limit in front of /__nuxt_island/ only mitigates array-shaped inputs, not the integer-amplification case.
References
- Bound helper:
packages/nuxt/src/app/components/vfor.ts - Transform:
packages/nuxt/src/components/plugins/islands-transform.ts - Slot helper:
packages/nuxt/src/app/components/utils.ts(vforToArray)
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | nuxt | ≥ 4.0.0&&< 4.5.1 | 4.5.1npm install nuxt@4.5.1 |
| 📦npm | nuxt | ≥ 3.1.0&&< 3.21.10 | 3.21.10npm install nuxt@3.21.10 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for nuxt, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update nuxt to 4.5.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-hxcr-hm88-mpq6 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-hxcr-hm88-mpq6 can be triaged on real exposure rather than presence alone.
Tailored to GHSA-hxcr-hm88-mpq6. 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-hxcr-hm88-mpq6 in your dependencies?
O3 Security finds GHSA-hxcr-hm88-mpq6 across npm dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.