{"cve":"CVE-2026-64649","nvd":{"published":"2026-07-27T20:16:40.703","modified":"2026-10-24T13:10:00.147","status":"Analyzed","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.","cvss_v4":{"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},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","score":6.5},"cwes":["CWE-918"],"references":["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","https://github.com/vercel/next.js/security/advisories/GHSA-89xv-2m56-2m9x"],"products":["vercel:next.js"],"source":"nvd","synced_at":"2026-10-24T16:53:27.712498749+00:00"},"epss":{"cve":"CVE-2026-64649","score":0.00459,"percentile":0.39529,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-89xv-2m56-2m9x","url":"https://osv.dev/vulnerability/GHSA-89xv-2m56-2m9x","summary":"Next.js: Server-Side Request Forgery in Server Actions on custom servers","modified":"2026-09-10T03:50:51.547474623Z","packages":[{"ecosystem":"npm","name":"next","purl":"pkg:npm/next","ranges":[">=14.1.1 <15.5.21"],"fixed":["15.5.21"]},{"ecosystem":"npm","name":"next","purl":"pkg:npm/next","ranges":[">=16.0.0 <16.2.11"],"fixed":["16.2.11"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}