{"basis":"claimed","id":"CVE-2026-64649","name":"Next.js: Server-Side Request Forgery in Server Actions on Custom Servers","vendorProject":"vercel","product":"next.js","publishedAt":"2026-07-27","cvss":{"score":8.3,"severity":"HIGH","version":"4.0"},"exploited":null,"epss":{"score":0.00459,"percentile":0.39787,"date":"2026-11-02"},"coverage":{"cloudflare":{"status":"blocks","firstOn":"2026-07-21","daysToRule":null},"aws":{"status":"none","firstOn":null,"daysToRule":null},"azure":{"status":"none","firstOn":null,"daysToRule":null},"google":{"status":"none","firstOn":null,"daysToRule":null},"fastly":{"status":"no_history","firstOn":null,"daysToRule":null},"f5":{"status":"none","firstOn":null,"daysToRule":null},"akamai":{"status":"no_source","firstOn":null,"daysToRule":null},"crs":{"status":"none","firstOn":null,"daysToRule":null}},"title":"Next.js: Server-Side Request Forgery in Server Actions on Custom Servers","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. This issue has been fixed in versions 15.5.21 and 16.2.11.","cwes":["CWE-918"],"vendors":[{"vendor":"cloudflare","status":"blocks","basis":"claimed","firstOn":"2026-07-21","firstIsNew":false,"daysToRule":null,"daysAtMost":-6,"freePlan":false,"claims":[{"id":"f90fcc282db1f83def7e9a0749c88d90ffcfec47990426953eca81a641ba6cd6","cve_id":"CVE-2026-64649","vendor":"cloudflare","product":"Cloudflare Managed Ruleset","rule_id":"7fe6d6f3df774ae2a0011f20930091a3","rule_name":"Next.js - SSRF - CVE-2026-64649","change":"updated","default_action":"Block","published_on":"2026-07-21","source_url":"https://developers.cloudflare.com/changelog/post/2026-07-21-waf-release/","source_title":"WAF Release - 2026-07-21","excerpt":"Next.js - SSRF - CVE-2026-64649. Previous action: N/A. New action: Block. This was labeled as Generic Rules - Auth Bypass - 2.","first_seen_at":"2026-11-02T21:00:15.176Z"}]},{"vendor":"aws","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"azure","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"google","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"fastly","status":"no_history","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"f5","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"akamai","status":"no_source","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"crs","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]}],"updatedAt":"2026-11-02T21:17:16.518Z","cvssVector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial"},"measured":[],"social":{"total":0,"first_seen":null,"daily":[{"day":"2026-10-21","posts":0},{"day":"2026-10-22","posts":0},{"day":"2026-10-23","posts":0},{"day":"2026-10-24","posts":0},{"day":"2026-10-25","posts":0},{"day":"2026-10-26","posts":0},{"day":"2026-10-27","posts":0},{"day":"2026-10-28","posts":0},{"day":"2026-10-29","posts":0},{"day":"2026-10-30","posts":0},{"day":"2026-10-31","posts":0},{"day":"2026-11-01","posts":0},{"day":"2026-11-02","posts":0},{"day":"2026-11-03","posts":0}],"top_posts":[],"exploit_repositories":[]}}