CVE-2026-44576

Next.js: Cache poisoning in React Server Component responses

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.

Scores

Weaknesses (CWE)

• CWE-436

Advisories

• GHSA-wfc6-r584-vfw7 — Next.js vulnerable to cache poisoning in React Server Component responses

European references

• ENISA EUVD · EUVD-2026-30060
• GCVE · GCVE-0-2026-44576

CERT-FR advisories

• CERTFR-2026-AVI-1256 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
• CERTFR-2026-AVI-0901 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

• cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:* ≥ 14.2.0 < 15.5.16
• cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:* ≥ 16.0.0 < 16.2.5

Affected products

References

• https://github.com/vercel/next.js/security/advisories/GHSA-wfc6-r584-vfw7

Sources