CVE-2026-44572 Next.js: Middleware / Proxy redirects can be cache-poisoned

Next.js is a React framework for building full-stack web applications. From 12.2.0 to before 15.5.16 and 16.2.5, an external client could send a x-nextjs-data header on a normal request to a path handled by middleware that returns a redirect. When that happened, the middleware/proxy could treat t...

CVE-2026-44572

Next.js is a React framework for building full-stack web applications. From 12.2.0 to before 15.5.16 and 16.2.5, an external client could send a x-nextjs-data header on a normal request to a path handled by middleware that returns a redirect. When that happened, the middleware/proxy could treat t...

Next.js security vulnerabilities

Next.js is a React framework open source by Vercel. Versions of Next.js from 12.2.0 to 15.5.16, as well as versions before 16.2.5, have security vulnerabilities. These vulnerabilities arise from using the Pages Router and when configuring i18n and middleware or proxy authorization. In these cases...

CVE-2026-44572: Acceptance of Extraneous Untrusted Data With Trusted Data

Next.js is a React framework for building full-stack web applications. From 12.2.0 to before 15.5.16 and 16.2.5, an external client could send a x-nextjs-data header on a normal request to a path handled by middleware that returns a redirect. When that happened, the middleware/proxy could treat t...

Next.js x-nextjs-data redirect cache poisoning (GHSA-3g8h) detection

Fingerprints Next.js and flags versions 16.2.5 affected by GHSA-3g8h-86w9-wvmq x-nextjs-data redirect cache poisoning. !/usr/bin/env python3 -- coding: utf-8 -- from kittysploit import from lib.protocols.http.httpclient import Httpclient from lib.scanner.http.nextjsprobe import runnextjsversionsc...

Next.js x-nextjs-data redirect cache poisoning (GHSA-3g8h-86w9-wvmq)

Compares GET responses on a redirecting route with and without x-nextjs-data: 1. Pre-16.2.5 Next.js may return 2xx + x-nextjs-redirect without Location, breaking browsers and poisoning shared caches. Patched stacks keep a normal 3xx + Location. !/usr/bin/env python3 -- coding: utf-8 -- from...

Next.js has a Middleware / Proxy bypass in App Router applications via segment-prefetch routes - Incomplete Fix Follow-Up

Impact It was found that the fix addressing CVE-2026-44575 did not apply to middleware.ts with Turbopack. Refer to CVE-2026-44575 for further details. References - CVE CVE-2026-44575...

Acceptance of Extraneous Untrusted Data With Trusted Data

Overview next is a react framework. Affected versions of this package are vulnerable to Acceptance of Extraneous Untrusted Data With Trusted Data through the improper handling of the x-nextjs-data header in middleware or proxy redirect responses. An attacker can disrupt access to redirect paths b...

CVE-2026-42349

Clerk JavaScript is the official JavaScript repository for Clerk authentication. has, auth.protect, and related authorization predicates in @clerk/shared, @clerk/nextjs, @clerk/backend, and other framework SDKs can return true for certain combined authorization checks when the result should be...

GHSA-C4J6-FC7J-M34R Next.js vulnerable to server-side request forgery in applications using WebSocket upgrades

Impact Self-hosted applications using the built-in Node.js server can be vulnerable to server-side request forgery through crafted WebSocket upgrade requests. An attacker can cause the server to proxy requests to arbitrary internal or external destinations, which may expose internal services or...

Next.js has a Middleware / Proxy bypass through dynamic route parameter injection

Impact Applications that rely on middleware to protect dynamic routes can be vulnerable to authorization bypass. In affected deployments, specially crafted query parameters can alter the dynamic route value seen by the page while leaving the visible path unchanged, which can allow protected conte...

NPM: Next.js has a Middleware / Proxy bypass through dynamic route parameter injection

NPM: Next.js has a Middleware / Proxy bypass through dynamic route parameter injection vulnerability discovered by ? in WordPress Npm next versions = 15.4.0, 15.5.16...

GHSA-36QX-FR4F-26G5 Next.js has a Middleware / Proxy bypass in Pages Router applications using i18n

Impact Applications using the Pages Router with i18n configured and middleware/proxy-based authorization can allow unauthorized access to protected page data through locale-less /next/data//.json requests. In affected configurations, middleware does not run for the unprefixed data route, allowing...

NPM: Next.js has a Middleware / Proxy bypass in Pages Router applications using i18n

NPM: Next.js has a Middleware / Proxy bypass in Pages Router applications using i18n vulnerability discovered by ? in WordPress Npm next versions = 12.2.0, 15.5.16...

Next.js Vulnerable to Denial of Service with Server Components

A vulnerability affects certain React Server Components packages for versions 19.x and frameworks that use the affected packages, including Next.js 13.x, 14.x, 15.x, and 16.x using the App Router. The issue is tracked upstream as CVE-2026-23870. A specially crafted HTTP request can be sent to any...

CVE-2026-42349: Improper Check for Unusual or Exceptional Conditions

Clerk JavaScript is the official JavaScript repository for Clerk authentication. has, auth.protect, and related authorization predicates in @clerk/shared, @clerk/nextjs, @clerk/backend, and other framework SDKs can return true for certain combined authorization checks when the result should be...

PT-2026-39418

Name of the Vulnerable Software and Affected Versions Next.js versions 14.2.0 through 15.5.15 Next.js versions 16.0.0 through 16.2.4 Description Applications using React Server Components RSC are susceptible to cache poisoning when shared caches fail to correctly partition response variants. An...

PT-2026-39419

Name of the Vulnerable Software and Affected Versions Next.js versions 13.4.6 through 15.5.15 Next.js versions 16.0.0 through 16.2.4 Description React Server Component responses are susceptible to cache poisoning in deployments utilizing shared caches with insufficient response partitioning...

Malicious code in nextjs-chat-with-ai-service (npm)

--- -= Per source details. Do not edit below this line.=- Source: amazon-inspector 8ff3e52e4957291f626e1225ab3b81194c80cd8c6037f943298f6170f98dbe9b The package nextjs-chat-with-ai-service was found to contain malicious code. Source: ghsa-malware...

MAL-2026-3241 Malicious code in nextjs-chat-with-ai-service (npm)

--- -= Per source details. Do not edit below this line.=- Source: amazon-inspector 8ff3e52e4957291f626e1225ab3b81194c80cd8c6037f943298f6170f98dbe9b The package nextjs-chat-with-ai-service was found to contain malicious code. Source: ghsa-malware...