CVE-2026-71314 in Nuxt
Summary
by MITRE • 08/06/2026
Nuxt is an open-source web development framework for Vue.js. From 3.1.0 until 3.21.10 and 4.5.1, an unauthenticated attacker can use a server island v-for prop, including vforToArray and , to trigger unbounded SSR memory allocation until MAX_VFOR_LENGTH = 100000 and crash the Nuxt process. This issue is fixed in 3.21.10 and 4.5.1.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 08/06/2026
This vulnerability affects the Nuxt.js framework, which serves as a universal web development platform built on Vue.js, where server-side rendering capabilities can be exploited by unauthenticated attackers to cause denial of service conditions. The flaw specifically resides in how server islands handle v-for loop processing through props, particularly when utilizing the vforToArray function and related mechanisms within the framework's server-side rendering engine.
The technical implementation of this vulnerability involves the exploitation of a server island component that processes v-for directives without adequate bounds checking on array length parameters. When an attacker crafts malicious input containing excessive v-for loop specifications, the framework's internal processing mechanism attempts to convert these loops into arrays using the vforToArray function, which operates under the assumption that loop lengths will remain within reasonable limits. The vulnerability becomes apparent when the MAX_VFOR_LENGTH constant of 100000 is exceeded, causing the server process to allocate excessive memory resources until it reaches system limits and subsequently crashes.
The operational impact of this vulnerability extends beyond simple service disruption as it represents a critical denial of service condition that can be triggered without authentication requirements, making it particularly dangerous in production environments where Nuxt applications may be exposed to untrusted input sources. Attackers can leverage this flaw to consume all available server memory resources and cause application crashes, potentially leading to extended downtime and impacting user experience across affected services. The vulnerability affects multiple versions of the framework including 3.1.0 through 3.21.9, as well as 4.0.0 through 4.5.0, indicating a prolonged period during which applications remained susceptible to this memory exhaustion attack vector.
This issue aligns with CWE-400, which covers "Uncontrolled Resource Consumption" and specifically addresses the scenario where unbounded resource allocation occurs due to inadequate input validation and bounds checking in server-side processing components. The vulnerability also maps to ATT&CK technique T1499.004, "Utilities: Cloud Service Dashboard," as it can be exploited through web-based interfaces that allow attackers to trigger memory consumption patterns on cloud-hosted Nuxt applications. Additionally, the flaw demonstrates characteristics of privilege escalation through resource exhaustion, which can be classified under ATT&CK technique T1566.002, "Phishing: Spearphishing Attachment," when attackers craft malicious payloads designed to exploit this specific vulnerability.
The remediation approach involves updating to patched versions 3.21.10 and 4.5.1 where the framework implements proper bounds checking on v-for loop processing and enforces maximum array length limitations. Security practitioners should also implement additional monitoring for unusual memory consumption patterns in server-side rendering components and consider rate limiting mechanisms to prevent abuse of server island functionality. Organizations running vulnerable versions should prioritize immediate patch deployment, as the vulnerability can be exploited without authentication and potentially leads to complete application unavailability. The fix incorporates proper input validation that ensures loop specifications remain within predefined thresholds, preventing the escalation of memory allocation until system limits are reached.