Next.js i18n Pages data-route middleware bypass (CVE-2026-44573)

Pages Router with i18n exposes /next/data///.json. On vulnerable Next.js, /next/data//.json no locale can skip the middleware matcher while x-nextjs-data: 1 forces the data handler — leaking getServerSideProps JSON that should have been gated. Set sentinel to a string your protected page embeds i...

Next.js dynamic-route param injection (CVE-2026-44574)

Probes GHSA-492v-c6pp-mqqv: inbound nxtP / nxtI internal search params plus proxy-style headers can skew App Router params vs middleware pathname; second probe uses %252F in a dynamic segment. Configure sentinel to a string only the protected page renders. !/usr/bin/env python3 -- coding: utf-8 -...

Next.js router-server WebSocket upgrade SSRF (CVE-2026-44578)

Exploits CVE-2026-44578: WebSocket upgrade handler proxies absolute http:// request-line URIs GET, port 80 without honouring finished/308 from normalizeRepeatedSlashes. Actions: test confirm, aws / azure IMDS harvest, custom ssrfurl. Self-hosted only; Vercel/nginx often block. Fixed in 15.5.16 /...

Next.js CSP-nonce reflected XSS (CVE-2026-44581)

GET with Content-Security-Policy: script-src 'nonce-' where the payload uses a TAB as separator so the legacy nonce parser accepts it; reflected nonce must not be attribute-escaped ' where the payload uses a TAB " "as separator so the legacy nonce parser accepts it; reflected nonce must not be "...

Next.js WebSocket upgrade SSRF (CVE-2026-44578) detection

Detects Next.js and flags CVE-2026-44578 router-server WebSocket upgrade SSRF. Affected: 13.4.13–15.5.15 and 16.0.0–16.2.4; fixed in 15.5.16 / 16.2.5. Self-hosted Node server only Vercel not affected. Optional active probe: absolute-URI WebSocket upgrade to AWS IMDSv1. Companion auxiliary confirm...

Next.js CSP-nonce reflected XSS (CVE-2026-44581) detection

Fingerprints Next.js and flags versions 16.2.5 affected by CVE-2026-44581 CSP nonce reflected XSS. !/usr/bin/env python3 -- coding: utf-8 -- from kittysploit import from lib.protocols.http.httpclient import Httpclient from lib.scanner.http.nextjsprobe import runnextjsversionscan class...

Next.js _rsc weak cache-busting hash collision (CVE-2026-44582)

Reimplements the legacy 32-bit FNV-style mix and runs a birthday search for a colliding state-tree, next-url tuple. Optional HTTP GET with RSC prefetch headers can probe CDN cache behaviour. CPU-heavy; patched Next.js uses a stronger mix = 16.2.5. !/usr/bin/env python3 -- coding: utf-8 -- import...

Next.js i18n data-route middleware bypass (CVE-2026-44573) detection

Fingerprints Next.js and flags versions 16.2.5 affected by CVE-2026-44573 i18n /next/data middleware bypass. !/usr/bin/env python3 -- coding: utf-8 -- from kittysploit import from lib.protocols.http.httpclient import Httpclient from lib.scanner.http.nextjsprobe import runnextjsversionscan class...

Next.js dynamic-route param injection (CVE-2026-44574) detection

Fingerprints Next.js and flags versions 16.2.5 affected by CVE-2026-44574 dynamic route parameter injection. !/usr/bin/env python3 -- coding: utf-8 -- from kittysploit import from lib.protocols.http.httpclient import Httpclient from lib.scanner.http.nextjsprobe import runnextjsversionscan class...

Next.js _rsc weak hash collision (CVE-2026-44582) detection

Fingerprints Next.js and flags versions 16.2.5 affected by CVE-2026-44582 weak rsc cache-busting hash. !/usr/bin/env python3 -- coding: utf-8 -- from kittysploit import from lib.protocols.http.httpclient import Httpclient from lib.scanner.http.nextjsprobe import runnextjsversionscan class...

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 next/script beforeInteractive XSS (GHSA-gx5p) detection

Fingerprints Next.js and flags versions 16.2.5 affected by GHSA-gx5p-jg67-6x7h next/script beforeInteractive XSS. !/usr/bin/env python3 -- coding: utf-8 -- from kittysploit import from lib.protocols.http.httpclient import Httpclient from lib.scanner.http.nextjsprobe import runnextjsversionscan...

Next.js RSC / HTML cache poisoning (GHSA-wfc6) detection

Fingerprints Next.js and flags versions 16.2.5 affected by GHSA-wfc6-r584-vfw7 RSC misclassified as text/html 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...

Next.js /_next/image optimizer OOM (GHSA-h64f-5h5j-jqjh)

GET /next/image?url=&w=&q= against a large same-origin asset. Pre-16.2.5 the optimizer may decode the full image into memory OOM / long wall. v16.2.5 adds limits. Streams the response in 64 KiB chunks; can stress the target — use only on systems you own. !/usr/bin/env python3 -- coding: utf-8 --...

Next.js RSC server-action DoS (CVE-2026-23870)

Form-encoded cyclic RSC reply with Next-Action + Accept: text/x-component. Pre-patch React Next.js 16.2.5 can spin CPU / blow the stack. Availability only. !/usr/bin/env python3 -- coding: utf-8 -- import time from concurrent.futures import ThreadPoolExecutor, ascompleted from urllib.parse import...

Next.js RSC server-action DoS (CVE-2026-23870) detection

Fingerprints Next.js and flags versions 16.2.5 affected by CVE-2026-23870 expensive cyclic RSC server-action parsing. !/usr/bin/env python3 -- coding: utf-8 -- from kittysploit import from lib.protocols.http.httpclient import Httpclient from lib.scanner.http.nextjsprobe import runnextjsversionsca...

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

Incomplete Fix Follow-Up vulnerability discovered by ? in WordPress Npm next versions = 15.2.0, 15.5.18...

NPM: Next.js's Middleware / Proxy redirects can be cache-poisoned

NPM: Next.js's Middleware / Proxy redirects can be cache-poisoned vulnerability discovered by ? in WordPress Npm next versions = 12.2.0, 15.5.16...

GHSA-3G8H-86W9-WVMQ Next.js's Middleware / Proxy redirects can be cache-poisoned

Impact Next.js uses the x-nextjs-data request header for internal data requests. On affected versions, an external client could send this header on a normal request to a path handled by middleware that returns a redirect. When that happened, the middleware/proxy could treat the request as a data...

9remote (>=0.1.0, <=0.1.8), @071yoon/log-console-core (0.1.0) +780 more potentially affected by CVE-2026-44572 via next (>=16.0.0, <=16.2.4)

next NPM version =16.0.0, =0.1.0, =1.1.0-beta.8, =1.1.0-beta.8, =1.1.0-beta.8, =1.1.0-beta.8, =1.1.0-beta.8, =1.1.0-beta.8, =1.1.0-beta.8, =1.1.0-beta.8, =1.1.0-beta.8, =1.1.0-beta.8, =1.1.0-beta.8, =1.1.0-beta.8, =1.1.0-beta.8, =1.1.0-beta.18 and more Source cves: CVE-2026-44572 Source advisory:...