{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*",
            "extracted_events": [
              {
                "introduced": "14.1.1"
              },
              {
                "fixed": "15.5.21"
              },
              {
                "introduced": "16.0.0"
              },
              {
                "fixed": "16.2.11"
              }
            ],
            "source": [
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "5f59ee5f197a09275da7a9fa876986f22f4b7711"
            },
            {
              "fixed": "e26f6ffaa710fc62ca0c8640db0e43b6663edf32"
            },
            {
              "introduced": "950609f96f694c5475d18cd2d72a0052ca04d4b9"
            },
            {
              "fixed": "9beca0821cf4606ae33466ed6f4fc75f2887a4da"
            },
            {
              "fixed": "b51206321854193208c0805ba42acc49287f942b"
            },
            {
              "fixed": "e3e5666ccead3a15162793d697af5e48b7cc0498"
            }
          ],
          "repo": "https://github.com/vercel/next.js",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-89xv-2m56-2m9x"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64649.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "\u003e= 16.0.0 \u003c 16.2.11"
          },
          {
            "last_affected": "\u003e= 16.0.0 \u003c 16.2.11"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "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.",
  "id": "CVE-2026-64649",
  "modified": "2026-08-12T03:51:11.595230939Z",
  "published": "2026-07-27T19:27:58.865Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/vercel/next.js/releases/tag/v15.5.21"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vercel/next.js/releases/tag/v16.2.11"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64649.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/vercel/next.js/security/advisories/GHSA-89xv-2m56-2m9x"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64649"
    },
    {
      "type": "FIX",
      "url": "https://github.com/vercel/next.js/commit/b51206321854193208c0805ba42acc49287f942b"
    },
    {
      "type": "FIX",
      "url": "https://github.com/vercel/next.js/commit/e3e5666ccead3a15162793d697af5e48b7cc0498"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Next.js: Server-Side Request Forgery in Server Actions on Custom Servers"
}