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CVE-2026-44576

MediumPublished

Next.js: Cache poisoning in React Server Component responses

Published: May 13, 2026
Updated: May 18, 2026
Assigning CNA: GitHub_M
Evidence observed: Aug 25, 2026

Primary CVSS

5.4/ 10Medium

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:L

EPSS probability estimate

0.3%

Low · next 30 days

Percentile: 22.3%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

next-16.2.4-pocsPoC
Next.js v16.2.4 Security PoC Collection (CVE-2026-23870, CVE-2026-44575, CVE-2026-44579, CVE-2026-44574, CVE-2026-44578, CVE-2026-44573, CVE-2026-44581, CVE-2026-44580, CVE-2026-44577, CVE-2026-44576, CVE-2026-44582, CVE-2026-44572)

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