GHSA-Q8WF-6R8G-63CH

Vulnerability from github – Published: 2026-07-22 23:02 – Updated: 2026-07-22 23:02
VLAI
Summary
Next.js: Denial of Service in the Image Optimization API using SVGs
Details

Impact

When self-hosting Next.js with the default image loader, the Image Optimization API can optimize remotely hosted images if configured (not enabled by default). If those images contain malicious content, they can cause CPU exhaustion in /_next/image endpoints.

  • If you are using config.images.remotePatterns, only the patterns in that array are impacted.
  • If you are using config.images.unoptimized: true, you are NOT impacted.
  • If you are using config.images.loader: 'custom', you are NOT impacted.
  • If you are using Vercel, you are NOT impacted.

Workarounds

If you cannot upgrade immediately, you can avoid the expensive work by setting config.experimental.imgOptSkipMetadata : true.

Severity
6.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "next"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "15.5.0"
            },
            {
              "fixed": "15.5.21"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "next"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "16.0.0"
            },
            {
              "fixed": "16.2.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-64644"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-407"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-22T23:02:05Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nWhen self-hosting Next.js with the default image loader, the Image Optimization API can optimize remotely hosted images if configured (not enabled by default). If those images contain malicious content, they can cause CPU exhaustion in  `/_next/image` endpoints.\n\n- If you are using `config.images.remotePatterns`, only the patterns in that array are impacted.\n- If you are using `config.images.unoptimized: true`, you are NOT impacted.\n- If you are using `config.images.loader: \u0027custom\u0027`, you are NOT impacted.\n- If you are using Vercel, you are NOT impacted.\n\n### Workarounds\n\nIf you cannot upgrade immediately, you can avoid the expensive work by setting `config.experimental.imgOptSkipMetadata : true`.",
  "id": "GHSA-q8wf-6r8g-63ch",
  "modified": "2026-07-22T23:02:05Z",
  "published": "2026-07-22T23:02:05Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/vercel/next.js/security/advisories/GHSA-q8wf-6r8g-63ch"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vercel/next.js/pull/96006"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vercel/next.js/commit/93cb90891402fa4c47798d03cb9e05c13233766c"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/vercel/next.js"
    },
    {
      "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Next.js: Denial of Service in the Image Optimization API using SVGs"
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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