CVE-2026-44582 Next.js: Cache poisoning via collisions in React Server Component cache-busting
Attackers can poison shared caches in Next.js deployments, causing users to receive incorrect response variants for specific URLs.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-44582?
CVE-2026-44582 is a low-severity vulnerability in Vercel Next.js, published on 13 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Next.js is a React framework for building full-stack web applications. From 13.4.6 to before 15.5.16 and 16.2.5, React Server Component responses can be vulnerable to cache poisoning in deployments that rely on shared caches with insufficient response partitioning. In affected conditions, collisions in the _rsc cache-busting value can allow an attacker to poison cache entries so users receive the wrong response variant for a given URL. This vulnerability is fixed in 15.5.16 and 16.2.5.
Weakness: CWE-328
Which versions are affected by CVE-2026-44582?
4 open source packages ship an affected version, including next. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
next npm | From 13.4.6 | 15.5.16 |
next npm | From 13.4.6 | 15.5.16 |
next npm | From 16.0.0 | 16.2.5 |
next npm | From 16.0.0 | 16.2.5 |
Products include Vercel Next.js.
How do I fix CVE-2026-44582?
Upgrade next to a fixed version for your release line: 15.5.16 or 16.2.5.
Is CVE-2026-44582 being exploited?
There is no known exploitation of CVE-2026-44582 in the wild and no public exploit code.
Other vulnerabilities in Vercel Next.js
- CVE-2025-29927 Authorization Bypass in Next.js Middleware
- CVE-2026-44578 Next.js: Server-side request forgery in applications using WebSocket upgrades
- CVE-2026-94483 Next.js: Server-Side Request Forgery in Image Optimization
- CVE-2026-64642 Next.js: Middleware / Proxy bypass in App Router applications using Turbopack and single locale
- CVE-2026-64645 Next.js: Server-Side Request Forgery in rewrites via attacker-controlled destination hostname
Sources
Also known as CLEANSTART-2026-AV98689, CLEANSTART-2026-MX70977, GHSA-vfv6-92ff-j949, MINI-3qj5-8pw8-5pqg, MINI-frw4-pg6m-w298, MINI-rc89-mjhp-gvj3 and 2 more.