{"id":"CVE-2026-64649","revision":"27ce8e00417a4faa910e4d36b95557c1","records":[{"revision":"27ce8e00417a4faa910e4d36b95557c1","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64649","aliases":[],"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.","state":0,"publishedAt":"2026-07-27T19:27:58.865+00:00","modifiedAt":"2026-07-28T14:12:06.654+00:00","affected":[{"ecosystem":"Vendor product","name":"next.js","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"vercel\",\n                    \"product\": \"next.js\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 14.1.1, < 15.5.21\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 16.0.0 < 16.2.11\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":8.3,"severity":"HIGH"}],"references":["https://github.com/vercel/next.js/security/advisories/GHSA-89xv-2m56-2m9x","https://github.com/vercel/next.js/commit/b51206321854193208c0805ba42acc49287f942b","https://github.com/vercel/next.js/commit/e3e5666ccead3a15162793d697af5e48b7cc0498","https://github.com/vercel/next.js/releases/tag/v15.5.21","https://github.com/vercel/next.js/releases/tag/v16.2.11"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64649","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64649","identifiers":["CVE-2026-64649"]},"retained":false,"historicalAffected":[]}],"coverage":[]}