{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0.3.0"
              },
              {
                "fixed": "1.20.2"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "bbba0a8f2e6c911bd73f3245bb7ca893024d07c9"
            },
            {
              "fixed": "da4b7fc8c89441a6f96205635fa70e329d1f0df7"
            }
          ],
          "repo": "https://github.com/opennextjs/opennextjs-cloudflare",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-2vc4-c4r6-p6v6"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-177",
      "CWE-180"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100409.json"
  },
  "details": "OpenNext Cloudflare is an open Next.js adapter for Cloudflare. From 0.3.0 until 1.20.2, applications that enable enableCacheInterception, rely on middleware for access control, and have a matching cached protected route process encoded pathnames inconsistently between middleware matching and cache lookup. An unauthenticated attacker can use a percent-encoded pathname that does not match authorization middleware but decodes to the cache key of a protected route, causing cached content to be returned without authorization. Malformed encodings can also be partially decoded, allowing cache lookup to continue with a pathname that middleware did not evaluate consistently. This issue is fixed in version 1.20.2.",
  "id": "CVE-2026-100409",
  "modified": "2026-10-16T02:30:29.815401819Z",
  "published": "2026-10-15T16:57:50.999Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100409.json"
    },
    {
      "type": "FIX",
      "url": "https://github.com/opennextjs/opennextjs-aws/pull/1199"
    },
    {
      "type": "FIX",
      "url": "https://github.com/opennextjs/opennextjs-aws/pull/1200"
    },
    {
      "type": "FIX",
      "url": "https://github.com/opennextjs/opennextjs-cloudflare/commit/38ea40b669be272ddf09a7df7e70c69d0b57404b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/opennextjs/opennextjs-cloudflare/releases/tag/@opennextjs/cloudflare@1.20.2"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/opennextjs/opennextjs-cloudflare/security/advisories/GHSA-2vc4-c4r6-p6v6"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-100409"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "OpenNext Cloudflare: Cache interception can bypass middleware protection for encoded paths"
}