CVE-2026-44582

Next.js: Cache poisoning via collisions in React Server Component cache-busting

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.

Scores

Weaknesses (CWE)

• CWE-328

Advisories

• GHSA-vfv6-92ff-j949 — Next.js vulnerable to cache poisoning via collisions in React Server Component cache-busting

European references

• ENISA EUVD · EUVD-2026-30084
• GCVE · GCVE-0-2026-44582

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:*:* ≥ 13.4.6 < 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-vfv6-92ff-j949

Sources