Next.js has cache poisoning in SSG/ISR rendering that leads to cross-user content substitution and persistent denial of service

{
  "id": "c615a5fa67beb6ee499a30f8ba90864302cf5d0c153af67ed1cec687581ae7e2",
  "url": "https://osv.dev/vulnerability/GHSA-mcj8-r9mp-w47p",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Next.js has cache poisoning in SSG/ISR rendering that leads to cross-user content substitution and persistent denial of service",
    "summary": "Next.js applications that use a root-level catch-all page together with statically generated or Incremental Static Regeneration routes can have their shared response cache poisoned by a single unauthenticated crafted request.",
    "evidence": "osv:GHSA-mcj8-r9mp-w47p",
    "products": [
      {
        "name": {
          "value": "next",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "16.3.8",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "next",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "15.5.27",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "GHSA-mcj8-r9mp-w47p",
      "aliases": [
        "CVE-2026-94484",
        "GHSA-mcj8-r9mp-w47p"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L"
        },
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "16.0.0"
                },
                {
                  "fixed": "16.3.8"
                }
              ]
            }
          ],
          "package": {
            "name": "next",
            "purl": "pkg:npm/next",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-mcj8-r9mp-w47p/GHSA-mcj8-r9mp-w47p.json"
          }
        },
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "15.0.0"
                },
                {
                  "fixed": "15.5.27"
                }
              ]
            }
          ],
          "package": {
            "name": "next",
            "purl": "pkg:npm/next",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-mcj8-r9mp-w47p/GHSA-mcj8-r9mp-w47p.json"
          }
        }
      ],
      "modified": "2026-10-07T20:45:04.800999218Z",
      "provider": "osv",
      "references": [
        "https://github.com/vercel/next.js/security/advisories/GHSA-mcj8-r9mp-w47p",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-94484",
        "https://github.com/vercel/next.js/commit/52c94abdd2ea5f416f5e8353ea8a2edd3fe311b8",
        "https://github.com/vercel/next.js/commit/719e4c67d6e92df60246f95e1d96e2dd60789a52",
        "https://github.com/vercel/next.js",
        "https://github.com/vercel/next.js/releases/tag/v15.5.27",
        "https://github.com/vercel/next.js/releases/tag/v16.3.8"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-524"
        ],
        "severity": "MODERATE",
        "github_reviewed": true,
        "nvd_published_at": "2026-10-02T16:16:51Z",
        "github_reviewed_at": "2026-10-07T20:31:13Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-94484",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/1/score"
  },
  "source_id": "core-osv",
  "document_id": 97262,
  "published_at": "2026-10-07T20:31:13+00:00"
}