{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "5.2"
              },
              {
                "fixed": "5.2.15"
              },
              {
                "introduced": "6.0"
              },
              {
                "fixed": "6.0.6"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "9e7cc2b628fe8fd3895986af9b7fc9525034c1b0"
            },
            {
              "fixed": "21e98408f84d22191e2c7ee4052bdd12d264fd3f"
            },
            {
              "introduced": "36b5f39d9372147f0e758f590e35ee2b2bc317dd"
            },
            {
              "fixed": "ee93f65169c280c9ab3d2ce103dd478c96d05065"
            }
          ],
          "repo": "https://github.com/django/django",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "DSF",
    "cwe_ids": [
      "CWE-178"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8404.json"
  },
  "details": "An issue was discovered in Django 5.2 before 5.2.15 and 6.0 before 6.0.6.\n`django.middleware.cache.UpdateCacheMiddleware` in Django does not match `Cache-Control` response directives case-insensitively, which allows remote attackers to read responses that were incorrectly cached because their `Cache-Control` directives used uppercase or mixed-case values.\nEarlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected.\nDjango would like to thank Ahmed Badawe for reporting this issue.",
  "id": "CVE-2026-8404",
  "modified": "2026-07-08T05:38:08.773163133Z",
  "published": "2026-06-03T13:16:29.593Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/django/django/"
    },
    {
      "type": "ADVISORY",
      "url": "https://docs.djangoproject.com/en/dev/releases/security/"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8404.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-8404"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.djangoproject.com/weblog/2026/jun/03/security-releases/"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/Django/"
    },
    {
      "type": "ARTICLE",
      "url": "https://groups.google.com/g/django-announce"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Potential exposure of private data via case-sensitive Cache-Control directives in UpdateCacheMiddleware"
}