CVE-2026-64643Medium▾ SunlitNext.js: Unauthenticated disclosure of internal Server Function endpoints
▾ Sunlit zone — Low / medium · no exploitation signal
impact 27.5 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 30.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via GHSA
0.5%
In Next.js applications using App Router, Server Actions (use server) or use cache endpoints can be disclosed bypassing any authentication on the pages where these endpoints are usually used.
Server Action IDs can be disclosed to unauthenticated users via publicly served client artifacts (for example, static chunks containing action references).
Affected users are applications using App Router + Server Actions.
By itself, this disclosure is typically a recon/enumeration primitive; however, it can increase risk when combined with other weaknesses.
Never assume any authentication claims at the use cache or use server boundary. Always authenticate within the boundary.
next >= 13.0.0, < 15.5.21next >= 16.0.0, < 16.2.11Upgrade to a patched release:
next 15.5.21next 16.2.11Connected by shared product, vendor, weakness, or advisory.
CVE-2026-64644MediumNext.js: Denial of Service in the Image Optimization API using SVGs
CVE-2026-64647MediumNext.js: Cache confusion of response bodies for requests with bodies containing invalid UTF-8 byte sequences
GHSA-2464-fhr4-w9xwCriticalNext.js: Unauthenticated Remote Code Execution in Image Optimization API when SVG files are used
CVE-2026-94482High· 8.2Next.js: Denial of Service in App Router using Server Actions
GHSA-673q-mjm6-r5xrCriticalNext.js: Unauthenticated Remote Code Execution in `use cache` functions returning typed arrays
GHSA-vcvr-r3jv-pc5jCriticalNext.js: Remote Code Execution in next/og ImageResponse