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CVE-2026-44576— Next.js: Cache poisoning in React Server Component responses

Quick assessment

Affected
vercel next.js
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Next.js是Vercel开源的一个 React 框架。 Next.js 14.2.0至15.5.16之前版本和16.2.5之前版本存在安全漏洞，该漏洞源于使用React Server Components时共享缓存未正确分区响应变体，可能导致缓存投毒，使后续访问者收到组件负载而非预期HTML。

CVSS 5.4 · Medium EPSS 0.30% · P21

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
vercel next.js >= 14.2.0, < 15.5.16 affected
>= 16.0.0, < 16.2.5 affected
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I. Basic Information for CVE-2026-44576

Vulnerability Information
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Vulnerability Title
Next.js: Cache poisoning in React Server Component responses
Source: CVE Program / CVE List V5
Vulnerability Description
Next.js is a React framework for building full-stack web applications. From 14.2.0 to before 15.5.16 and 16.2.5, applications using React Server Components can be vulnerable to cache poisoning when shared caches do not correctly partition response variants. Under affected conditions, an attacker can cause an RSC response to be served from the original URL and poison shared cache entries so later visitors receive component payloads instead of the expected HTML. This vulnerability is fixed in 15.5.16 and 16.2.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
解释冲突
Source: CVE Program / CVE List V5
Vulnerability Title
Next.js 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Next.js是Vercel开源的一个 React 框架。 Next.js 14.2.0至15.5.16之前版本和16.2.5之前版本存在安全漏洞，该漏洞源于使用React Server Components时共享缓存未正确分区响应变体，可能导致缓存投毒，使后续访问者收到组件负载而非预期HTML。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
vercel next.js >= 14.2.0, < 15.5.16 -

II. Public POCs for CVE-2026-44576

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III. Intelligence Information for CVE-2026-44576

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Vendor Advisories for CVE-2026-44576 (1)

Same Patch Batch · vercel · 2026-05-13 · 13 CVEs total

CVE-2026-44578 8.6 HIGH Next.js: Server-side request forgery in applications using WebSocket upgrades
CVE-2026-44574 8.1 HIGH Next.js: Middleware / Proxy bypass through dynamic route parameter injection
CVE-2026-45109 7.5 HIGH Next.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes
CVE-2026-44579 7.5 HIGH Next.js: Denial of Service via connection exhaustion in applications using Cache Component
CVE-2026-44575 7.5 HIGH Next.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes
CVE-2026-44573 7.5 HIGH Next.js: Middleware / Proxy bypass in Pages Router applications using i18n
CVE-2026-44580 6.1 MEDIUM Next.js: Cross-site scripting in beforeInteractive scripts with untrusted input
CVE-2026-44577 5.9 MEDIUM Next.js: Denial of Service in the Image Optimization API
CVE-2026-44479 5.5 MEDIUM Vercel: Non-interactive mode includes CLI arguments in suggested command output
CVE-2026-44581 4.7 MEDIUM Next.js: Cross-site scripting in App Router applications using CSP nonces
CVE-2026-44572 3.7 LOW Next.js: Middleware / Proxy redirects can be cache-poisoned
CVE-2026-44582 3.7 LOW Next.js: Cache poisoning via collisions in React Server Component cache-busting

IV. Related Vulnerabilities

Same product: next.js
Same vendor: vercel
Same weakness: CWE-436

V. Comments for CVE-2026-44576

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