{
  "canonical_id": "nextjs--CVE-2026-27979",
  "system_id": "nextjs",
  "display_name": "Next.js",
  "category": "frameworks",
  "advisory_mode": "core",
  "title": "Next.js: Unbounded postponed resume buffering can lead to DoS",
  "summary": "## Summary\nA 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.\n\n## Impact\nIn 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.\n\n## Patches\nFixed by enforcing size limits across all postponed-body buffering paths and erroring when limits are exceeded.  \n\n## Workarounds\nIf upgrade is not immediately possible:\n- Block requests containing the `next-resume` header, as this is never valid to be sent from an untrusted client.",
  "published_at": "2026-03-17T16:16:49Z",
  "updated_at": "2026-03-17T16:31:34.160932Z",
  "severity": "medium",
  "cvss_score": 4.0,
  "exploit_status": "unknown",
  "source_confidence": "official",
  "official_source_url": "https://github.com/vercel/next.js/security/advisories/GHSA-h27x-g6w4-24gq",
  "secondary_source_urls": [
    "https://github.com/vercel/next.js/commit/c885d4825f800dd1e49ead37274dcd08cdd6f3f1",
    "https://github.com/vercel/next.js",
    "https://github.com/vercel/next.js/releases/tag/v16.1.7"
  ],
  "aliases": [
    "CVE-2026-27979",
    "GHSA-h27x-g6w4-24gq"
  ],
  "cve_ids": [
    "CVE-2026-27979"
  ],
  "ghsa_ids": [
    "GHSA-h27x-g6w4-24gq"
  ],
  "osv_ids": [
    "GHSA-h27x-g6w4-24gq"
  ],
  "affected_versions": [
    "introduced=16.0.1, fixed<16.1.7"
  ],
  "fixed_versions": [
    "16.1.7"
  ],
  "package_name": "next",
  "render_markdown": true,
  "case_path": "07-framework-security/frameworks/nextjs/cases/nextjs-cve-2026-27979.md",
  "secure_code_topics": [
    "authz-server-side-recheck",
    "proxy-trust-boundary",
    "token-cookie-storage"
  ],
  "status": "generated",
  "triage_reasons": [],
  "verification_status": "triage-manual",
  "verification_mode": "synthetic",
  "last_verified_at": null,
  "last_run_id": null,
  "evidence_bundle": null,
  "browser_evidence": {
    "required": false,
    "present": false,
    "refs": []
  },
  "repro_profile_id": "nextjs-proxy-boundary",
  "artifact_mode": "official-source",
  "blocked_reason": null,
  "metadata": {
    "source_names": [
      "OSV Next.js"
    ],
    "source_kinds": [
      "osv-batch"
    ],
    "candidate_count": 1
  }
}