High [CVE-2026-64649] Server-Side Request Forgery via malicious host redirection in Server Actions
This high-severity Red Hat Linux advisory covers CVE-2026-64649 affecting Streams for Apache Kafka 3.2.1, Red Hat Enterprise Linux AI (RHEL AI) 3, streams for Apache Kafka 2.
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Summary
Next.js is a React framework for building full-stack web applications. In versions 14.1.1 through 15.5.20 and 16.0.0 through 16.2.10, when a Server Action forwards or redirects a request, an attacker can cause the server to send that outbound request to a malicious host (Server-Side Request Forgery).
This requires the attacker's request to control Host-associated headers. In some configurations, it's also possible to obtain internal values that weaken middleware/proxy authorization.
Applications that use Server Actions are affected when the incoming host header is not fixed to a trusted value. This typically occurs on custom servers, or on deployments not behind a proxy that pins the host.
Managed hosting pins the host upstream and is not affected; next start and standalone output do the same from version 14.2 onward. This issue has been fixed in versions 15.5.21 and 16.2.11.
This can lead to Server-Side Request Forgery (SSRF), where the server is tricked into making requests to an attacker-controlled host. Such an attack could potentially expose internal system information or bypass authorization controls.
This Important Server-Side Request Forgery (SSRF) flaw in Next.js Server Actions allows an attacker to redirect outbound requests to a malicious host.
- 14.1.1
- 15.5.20
- 16.0.0
- 16.2.10
Official advisory · high-confidence parse· fetched 27 days ago·verify at source
- 15.5.21
- 16.2.11
- next
- RHSA-2026:54435
Official advisory · high-confidence parse· fetched 27 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 interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 27 days ago·verify at source
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