Vulnerability · Published Oct 1, 2026 · Assigned by GitHub_M
CVE-2026-103004next.js cache leak on warm `use cache` handlers accessing root param
Medium 6.3
In plain English
A medium-severity security flaw in next.js from vercel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Next.js versions from 16.3.0 to 16.3.7 warm `use cache` handlers using `next/root-params` and can leak their return value to pages with different root params. With Cache Components enabled (cacheComponents: true), a 'use cache' function that calls another 'use cache' function that reads a root param can be keyed incorrectly when the inner call is served from an existing entry: the enclosing function's cache key then omits that root param. The enclosing entry is written once and reused for all root param values, so a response for one root param value can serve content produced for a different value — whether the page is prerendered at build time or at runtime, or rendered dynamically. Shared cache headers let downstream caches redistribute the content further. What values are leaked cannot be attacker controlled. Which value's content is served depends only on which invocation wrote the entry first. This has been patched in 16.3.8.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | next | 16.3.8 | GHSA-h694-7cp9-m8p3 |
Affected products (as reported)
Weakness: CWE-524 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
References
- https://github.com/vercel/next.js/security/advisories/GHSA-h694-7cp9-m8p3 x_refsource_CONFIRM
- https://github.com/vercel/next.js/releases/tag/v16.3.8 x_refsource_MISC