GHSA-wfc6-r584-vfw7 · Severity: medium · Ecosystem: npm — Next.js vulnerable to cache poisoning in React Server Component responses
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.
Conclusion & alert: CVE-2026-44576 is rated Low Risk (22.2/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.01%). Mandatory action: Monitor for updates and reassess as exploit intelligence or EPSS changes.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-05-14 | — | 0.01% | — |
Full EPSS history (1 record total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 5.4 | 3.1 | MEDIUM |
|
2.2 | 2.7 | [email protected] |
GHSA-wfc6-r584-vfw7 · Severity: medium · Ecosystem: npm — Next.js vulnerable to cache poisoning in React Server Component responses
| URL | Tags |
|---|---|
| https://github.com/vercel/next.js/security/advisories/GHSA-wfc6-r584-vfw7 | Vendor Advisory |