{"schemaVersion":3,"id":"CVE-2026-64649","aliases":["CGA-4mjf-3g4c-vh9f","CGA-4x78-9pxh-ggvg","CGA-857x-557g-pc58","CGA-862f-jc6g-frm6","CGA-grqc-r5fp-4v9w","CGA-r5q8-4qcc-mgv2","GHSA-89xv-2m56-2m9x","CGA-34rf-3642-q84h","CGA-39h4-425f-p7pw","CGA-3mwf-52cp-cxwp","CGA-3w4r-9x59-vpm6","CGA-65q2-hjpm-759r","CGA-6j93-pjrp-84pr","CGA-73fq-8859-fcfv","CGA-9p3p-hr7w-8268","CGA-c87x-cmcq-x9cj","CGA-cmwm-q7ff-3574","CGA-g7r6-263q-775f","CGA-h726-xjm4-44pf","CGA-m27v-fj68-63xc","CGA-mhmp-3x63-fgjv","CGA-p4p3-8j4m-9h3j","CGA-pcqg-ghr5-4g72","CGA-qgjh-hr85-qgx3","CGA-rx4f-9353-p5w7","CGA-v653-3f6p-g4pr","CGA-v65r-f377-5m5g","CGA-vfc9-6fwr-9qrm","CGA-xvc4-552x-5vvx"],"status":"published","duplicateOf":null,"title":null,"description":"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. 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