{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "e08402bfad8db05b0df820daf4f08c9c65ab1f7b"
            },
            {
              "fixed": "bdf3e3577a6d55ea186a48238d61fbd8da07a626"
            }
          ],
          "repo": "https://github.com/vercel/next.js",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-h27x-g6w4-24gq"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-770"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27979.json"
  },
  "details": "Next.js is a React framework for building full-stack web applications. Starting in version 16.0.1 and prior to version 16.1.7, a request containing the `next-resume: 1` header (corresponding with a PPR resume request) would buffer request bodies without consistently enforcing `maxPostponedStateSize` in certain setups. The previous mitigation protected minimal-mode deployments, but equivalent non-minimal deployments remained vulnerable to the same unbounded postponed resume-body buffering behavior. In applications using the App Router with Partial Prerendering capability enabled (via `experimental.ppr` or `cacheComponents`), an attacker could send oversized `next-resume` POST payloads that were buffered without consistent size enforcement in non-minimal deployments, causing excessive memory usage and potential denial of service. This is fixed in version 16.1.7 by enforcing size limits across all postponed-body buffering paths and erroring when limits are exceeded. If upgrading is not immediately possible, block requests containing the `next-resume` header, as this is never valid to be sent from an untrusted client.",
  "id": "CVE-2026-27979",
  "modified": "2026-04-01T23:10:01.275375671Z",
  "published": "2026-03-18T00:13:29.748Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/vercel/next.js/releases/tag/v16.1.7"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27979.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/vercel/next.js/security/advisories/GHSA-h27x-g6w4-24gq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27979"
    },
    {
      "type": "FIX",
      "url": "https://github.com/vercel/next.js/commit/c885d4825f800dd1e49ead37274dcd08cdd6f3f1"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Next.js: Unbounded postponed resume buffering can lead to DoS"
}