High [CVE-2026-64641] Denial of Service via crafted requests to App Router with Server Actions
This high-severity Red Hat Linux advisory covers CVE-2026-64641 affecting Streams for Apache Kafka 3.2.1, Red Hat Build of Keycloak, Red Hat Ceph Storage 5.
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Summary
Next.js is a React framework for building full-stack web applications. In versions 13.0.0 through 15.5.20 and 16.0.0 through 16.2.10, 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.
This issue has been fixed in versions 15.5.21 and 16.2.11. A remote attacker can send specially crafted requests to Next.js applications that utilize the App Router with Server Actions.
This can lead to excessive CPU usage, causing the application to become unresponsive and preventing it from processing further requests, resulting in a Denial of Service (DoS). Important: A denial of service flaw exists in Next.js applications utilizing the App Router with Server Actions.
Crafted requests can lead to excessive CPU consumption, potentially disrupting service availability for affected Red Hat products that embed or depend on vulnerable Next.js versions. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-770.
Affected products named by the advisory: Streams for Apache Kafka 3.2.1; Red Hat Build of Keycloak; Red Hat Ceph Storage 5; Red Hat Ceph Storage 6; and 7 more.
- 13.0.0
- 15.5.20
- 16.0.0
- 16.2.10
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
- 15.5.21
- 16.2.11
- next
- RHSA-2026:54435
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
Mitigation
Upgrade to a fixed release: 15.5.21, 16.2.11, next, RHSA-2026:54435. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
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