CVE-2026-64641High▾ TwilightNext.js: Denial of Service in App Router using Server Actions
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.3 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 28.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via GHSA
0.5%
0.5% → 1.4%
Crafted requests targeting Next.js applications using App Router with at least one Server Action can lead to excessive CPU usage blocking processing of further requests in the same process.
No workaround exists besides upgrading. Applications using Pages Router or not using Server Actions are not vulnerable.
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-2026-64648MediumNext.js: Cache confusion of response bodies for requests with bodies
CVE-2026-64649HighNext.js: Server-Side Request Forgery in Server Actions on custom servers
CVE-2026-64643MediumNext.js: Unauthenticated disclosure of internal Server Function endpoints
CVE-2026-64644MediumNext.js: Denial of Service in the Image Optimization API using SVGs
CVE-2026-64645HighNext.js: Server-Side Request Forgery in rewrites via attacker-controlled destination hostname
CVE-2026-64646MediumNext.js: Unbounded Server Action payload in Edge runtime