Vulnerability-Lookup

UBUNTU-CVE-2026-8404 (CVE-2026-8404)

Vulnerability from osv_ubuntu – Published: 2026-06-03 13:00 – Updated: 2026-06-11 13:02 – Source website

Details

An issue was discovered in Django 5.2 before 5.2.15 and 6.0 before 6.0.6. 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. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to thank Ahmed Badawe for reporting this issue.

Severity

3.1 (Low)


                    
                      CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N

5.3 (Medium)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

2.3 (Low)


                    
                      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

N/A (UNKNOWN)

low

References

URL

Type

	https://ubuntu.com/security/CVE-2026-8404	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-8404	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-django",
            "binary_version": "1.6.11-0ubuntu1.3+esm11"
          }
        ],
        "priority_reason": "The Django developers have rated this issue as being low severity"
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "python-django",
        "purl": "pkg:deb/ubuntu/python-django@1.6.11-0ubuntu1.3+esm11?arch=source\u0026distro=esm-infra-legacy/trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.5.4-1ubuntu1",
        "1.6-1",
        "1.6.1-1",
        "1.6.1-2",
        "1.6.1-2ubuntu0.1",
        "1.6.1-2ubuntu0.2",
        "1.6.1-2ubuntu0.3",
        "1.6.1-2ubuntu0.4",
        "1.6.1-2ubuntu0.5",
        "1.6.1-2ubuntu0.6",
        "1.6.1-2ubuntu0.8",
        "1.6.1-2ubuntu0.9",
        "1.6.1-2ubuntu0.10",
        "1.6.1-2ubuntu0.11",
        "1.6.1-2ubuntu0.12",
        "1.6.1-2ubuntu0.13",
        "1.6.1-2ubuntu0.14",
        "1.6.1-2ubuntu0.15",
        "1.6.1-2ubuntu0.16",
        "1.6.11-0ubuntu1",
        "1.6.11-0ubuntu1.1",
        "1.6.11-0ubuntu1.2",
        "1.6.11-0ubuntu1.3",
        "1.6.11-0ubuntu1.3+esm1",
        "1.6.11-0ubuntu1.3+esm2",
        "1.6.11-0ubuntu1.3+esm3",
        "1.6.11-0ubuntu1.3+esm4",
        "1.6.11-0ubuntu1.3+esm5",
        "1.6.11-0ubuntu1.3+esm6",
        "1.6.11-0ubuntu1.3+esm7",
        "1.6.11-0ubuntu1.3+esm8",
        "1.6.11-0ubuntu1.3+esm9",
        "1.6.11-0ubuntu1.3+esm10",
        "1.6.11-0ubuntu1.3+esm11"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-django",
            "binary_version": "1.8.7-1ubuntu5.15+esm12"
          },
          {
            "binary_name": "python-django-common",
            "binary_version": "1.8.7-1ubuntu5.15+esm12"
          },
          {
            "binary_name": "python3-django",
            "binary_version": "1.8.7-1ubuntu5.15+esm12"
          }
        ],
        "priority_reason": "The Django developers have rated this issue as being low severity"
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "python-django",
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      },
      "ranges": [
        {
          "events": [
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            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
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        "1.7.9-1ubuntu5",
        "1.8.5-2ubuntu1",
        "1.8.7-1ubuntu1",
        "1.8.7-1ubuntu2",
        "1.8.7-1ubuntu3",
        "1.8.7-1ubuntu4",
        "1.8.7-1ubuntu5",
        "1.8.7-1ubuntu5.1",
        "1.8.7-1ubuntu5.2",
        "1.8.7-1ubuntu5.4",
        "1.8.7-1ubuntu5.5",
        "1.8.7-1ubuntu5.6",
        "1.8.7-1ubuntu5.7",
        "1.8.7-1ubuntu5.8",
        "1.8.7-1ubuntu5.9",
        "1.8.7-1ubuntu5.10",
        "1.8.7-1ubuntu5.11",
        "1.8.7-1ubuntu5.12",
        "1.8.7-1ubuntu5.13",
        "1.8.7-1ubuntu5.14",
        "1.8.7-1ubuntu5.15",
        "1.8.7-1ubuntu5.15+esm1",
        "1.8.7-1ubuntu5.15+esm3",
        "1.8.7-1ubuntu5.15+esm4",
        "1.8.7-1ubuntu5.15+esm5",
        "1.8.7-1ubuntu5.15+esm6",
        "1.8.7-1ubuntu5.15+esm7",
        "1.8.7-1ubuntu5.15+esm8",
        "1.8.7-1ubuntu5.15+esm9",
        "1.8.7-1ubuntu5.15+esm10",
        "1.8.7-1ubuntu5.15+esm11",
        "1.8.7-1ubuntu5.15+esm12"
      ]
    },
    {
      "ecosystem_specific": {
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          {
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          },
          {
            "binary_name": "python3-django",
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          }
        ],
        "priority_reason": "The Django developers have rated this issue as being low severity"
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "python-django",
        "purl": "pkg:deb/ubuntu/python-django@1:1.11.11-1ubuntu1.21+esm15?arch=source\u0026distro=esm-infra/bionic"
      },
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        "1:1.11.11-1ubuntu1.1",
        "1:1.11.11-1ubuntu1.2",
        "1:1.11.11-1ubuntu1.3",
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        "1:1.11.11-1ubuntu1.14",
        "1:1.11.11-1ubuntu1.15",
        "1:1.11.11-1ubuntu1.16",
        "1:1.11.11-1ubuntu1.17",
        "1:1.11.11-1ubuntu1.18",
        "1:1.11.11-1ubuntu1.19",
        "1:1.11.11-1ubuntu1.20",
        "1:1.11.11-1ubuntu1.21",
        "1:1.11.11-1ubuntu1.21+esm1",
        "1:1.11.11-1ubuntu1.21+esm2",
        "1:1.11.11-1ubuntu1.21+esm3",
        "1:1.11.11-1ubuntu1.21+esm4",
        "1:1.11.11-1ubuntu1.21+esm5",
        "1:1.11.11-1ubuntu1.21+esm6",
        "1:1.11.11-1ubuntu1.21+esm7",
        "1:1.11.11-1ubuntu1.21+esm8",
        "1:1.11.11-1ubuntu1.21+esm9",
        "1:1.11.11-1ubuntu1.21+esm10",
        "1:1.11.11-1ubuntu1.21+esm11",
        "1:1.11.11-1ubuntu1.21+esm12",
        "1:1.11.11-1ubuntu1.21+esm13",
        "1:1.11.11-1ubuntu1.21+esm14",
        "1:1.11.11-1ubuntu1.21+esm15"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-django",
            "binary_version": "2:2.2.12-1ubuntu0.29+esm8"
          }
        ],
        "priority_reason": "The Django developers have rated this issue as being low severity"
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "python-django",
        "purl": "pkg:deb/ubuntu/python-django@2:2.2.12-1ubuntu0.29+esm8?arch=source\u0026distro=esm-infra/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
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        }
      ],
      "versions": [
        "1:1.11.22-1ubuntu1",
        "2:2.2.6-1ubuntu1",
        "2:2.2.9-2ubuntu1",
        "2:2.2.10-1",
        "2:2.2.10-1ubuntu1",
        "2:2.2.11-1",
        "2:2.2.12-1",
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        "2:2.2.12-1ubuntu0.2",
        "2:2.2.12-1ubuntu0.3",
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        "2:2.2.12-1ubuntu0.9",
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        "2:2.2.12-1ubuntu0.25",
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        "2:2.2.12-1ubuntu0.27",
        "2:2.2.12-1ubuntu0.28",
        "2:2.2.12-1ubuntu0.29",
        "2:2.2.12-1ubuntu0.29+esm1",
        "2:2.2.12-1ubuntu0.29+esm2",
        "2:2.2.12-1ubuntu0.29+esm3",
        "2:2.2.12-1ubuntu0.29+esm4",
        "2:2.2.12-1ubuntu0.29+esm5",
        "2:2.2.12-1ubuntu0.29+esm6",
        "2:2.2.12-1ubuntu0.29+esm7",
        "2:2.2.12-1ubuntu0.29+esm8"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-django",
            "binary_version": "2:3.2.12-2ubuntu1.27"
          }
        ],
        "priority_reason": "The Django developers have rated this issue as being low severity"
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "python-django",
        "purl": "pkg:deb/ubuntu/python-django@2:3.2.12-2ubuntu1.27?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:2.2.24-1ubuntu1",
        "2:3.2.12-2",
        "2:3.2.12-2ubuntu1",
        "2:3.2.12-2ubuntu1.1",
        "2:3.2.12-2ubuntu1.2",
        "2:3.2.12-2ubuntu1.3",
        "2:3.2.12-2ubuntu1.4",
        "2:3.2.12-2ubuntu1.5",
        "2:3.2.12-2ubuntu1.6",
        "2:3.2.12-2ubuntu1.7",
        "2:3.2.12-2ubuntu1.8",
        "2:3.2.12-2ubuntu1.9",
        "2:3.2.12-2ubuntu1.10",
        "2:3.2.12-2ubuntu1.11",
        "2:3.2.12-2ubuntu1.12",
        "2:3.2.12-2ubuntu1.13",
        "2:3.2.12-2ubuntu1.14",
        "2:3.2.12-2ubuntu1.15",
        "2:3.2.12-2ubuntu1.16",
        "2:3.2.12-2ubuntu1.17",
        "2:3.2.12-2ubuntu1.18",
        "2:3.2.12-2ubuntu1.19",
        "2:3.2.12-2ubuntu1.20",
        "2:3.2.12-2ubuntu1.21",
        "2:3.2.12-2ubuntu1.22",
        "2:3.2.12-2ubuntu1.23",
        "2:3.2.12-2ubuntu1.24",
        "2:3.2.12-2ubuntu1.25",
        "2:3.2.12-2ubuntu1.26",
        "2:3.2.12-2ubuntu1.27"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-django",
            "binary_version": "3:4.2.11-1ubuntu1.16"
          }
        ],
        "priority_reason": "The Django developers have rated this issue as being low severity"
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "python-django",
        "purl": "pkg:deb/ubuntu/python-django@3:4.2.11-1ubuntu1.16?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3:4.2.4-1ubuntu2",
        "3:4.2.8-1",
        "3:4.2.9-1",
        "3:4.2.11-1",
        "3:4.2.11-1ubuntu1",
        "3:4.2.11-1ubuntu1.1",
        "3:4.2.11-1ubuntu1.2",
        "3:4.2.11-1ubuntu1.3",
        "3:4.2.11-1ubuntu1.4",
        "3:4.2.11-1ubuntu1.5",
        "3:4.2.11-1ubuntu1.6",
        "3:4.2.11-1ubuntu1.7",
        "3:4.2.11-1ubuntu1.8",
        "3:4.2.11-1ubuntu1.9",
        "3:4.2.11-1ubuntu1.10",
        "3:4.2.11-1ubuntu1.11",
        "3:4.2.11-1ubuntu1.12",
        "3:4.2.11-1ubuntu1.13",
        "3:4.2.11-1ubuntu1.14",
        "3:4.2.11-1ubuntu1.15",
        "3:4.2.11-1ubuntu1.16"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-django",
            "binary_version": "3:5.2.4-1ubuntu2.5"
          }
        ],
        "priority_reason": "The Django developers have rated this issue as being low severity"
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "python-django",
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      },
      "ranges": [
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          ],
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      ],
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        "3:4.2.18-1ubuntu1",
        "3:4.2.18-1ubuntu1.1",
        "3:5.2.4-1",
        "3:5.2.4-1ubuntu1",
        "3:5.2.4-1ubuntu2",
        "3:5.2.4-1ubuntu2.1",
        "3:5.2.4-1ubuntu2.2",
        "3:5.2.4-1ubuntu2.3",
        "3:5.2.4-1ubuntu2.4",
        "3:5.2.4-1ubuntu2.5"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-django",
            "binary_version": "3:5.2.9-0ubuntu4.1"
          }
        ],
        "priority_reason": "The Django developers have rated this issue as being low severity"
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "python-django",
        "purl": "pkg:deb/ubuntu/python-django@3:5.2.9-0ubuntu4.1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3:5.2.4-1ubuntu2",
        "3:5.2.4-1ubuntu3",
        "3:5.2.9-0ubuntu1",
        "3:5.2.9-0ubuntu2",
        "3:5.2.9-0ubuntu3",
        "3:5.2.9-0ubuntu4",
        "3:5.2.9-0ubuntu4.1"
      ]
    }
  ],
  "aliases": [],
  "details": "An issue was discovered in Django 5.2 before 5.2.15 and 6.0 before 6.0.6. `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. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to thank Ahmed Badawe for reporting this issue.",
  "id": "UBUNTU-CVE-2026-8404",
  "modified": "2026-06-11T13:02:01Z",
  "published": "2026-06-03T13:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-8404"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-8404"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "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"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-8404"
  ]
}

CVE-2026-8404 (GCVE-0-2026-8404)

Vulnerability from cvelistv5 – Published: 2026-06-03 13:16 – Updated: 2026-06-03 15:46

Title

Potential exposure of private data via case-sensitive Cache-Control directives in UpdateCacheMiddleware

Summary

An issue was discovered in Django 5.2 before 5.2.15 and 6.0 before 6.0.6. `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. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to thank Ahmed Badawe for reporting this issue.

Severity

3.1 (Low)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N

2.3 (Low)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-03 15:46 UTC

CWE

CWE-178 - Improper Handling of Case Sensitivity

Assigner

DSF mitre root Scorecard

References

3 references

URL	Tags
https://docs.djangoproject.com/en/dev/releases/se…	vendor-advisory
https://groups.google.com/g/django-announce	mailing-list
https://www.djangoproject.com/weblog/2026/jun/03/…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
djangoproject	Django	Affected: 6.0 , < 6.0.6 (python) Unaffected: 6.0.6 (python) Affected: 5.2 , < 5.2.15 (python) Unaffected: 5.2.15 (python)

Date Public

2026-06-03 08:00

Credits

Ahmed Badawe Jake Howard Natalia Bidart

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-8404",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-03T15:46:33.911128Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
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        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-03T15:46:40.439Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pypi.org/project/Django/",
          "defaultStatus": "unaffected",
          "packageName": "django",
          "product": "Django",
          "repo": "https://github.com/django/django/",
          "vendor": "djangoproject",
          "versions": [
            {
              "lessThan": "6.0.6",
              "status": "affected",
              "version": "6.0",
              "versionType": "python"
            },
            {
              "status": "unaffected",
              "version": "6.0.6",
              "versionType": "python"
            },
            {
              "lessThan": "5.2.15",
              "status": "affected",
              "version": "5.2",
              "versionType": "python"
            },
            {
              "status": "unaffected",
              "version": "5.2.15",
              "versionType": "python"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "Ahmed Badawe"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Jake Howard"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "Natalia Bidart"
        }
      ],
      "datePublic": "2026-06-03T08:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eAn issue was discovered in Django 5.2 before 5.2.15 and 6.0 before 6.0.6.\u003c/p\u003e\u003cp\u003e\u003ccode\u003edjango.middleware.cache.UpdateCacheMiddleware\u003c/code\u003e in Django does not match \u003ccode\u003eCache-Control\u003c/code\u003e response directives case-insensitively, which allows remote attackers to read responses that were incorrectly cached because their \u003ccode\u003eCache-Control\u003c/code\u003e directives used uppercase or mixed-case values.\u003c/p\u003e\u003cp\u003eEarlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected.\u003c/p\u003e\u003cp\u003eDjango would like to thank Ahmed Badawe for reporting this issue.\u003c/p\u003e"
            }
          ],
          "value": "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."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-204",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-204: Lifting Sensitive Data Embedded in Cache"
            }
          ]
        }
      ],
      "metrics": [
        {
          "other": {
            "content": {
              "namespace": "https://docs.djangoproject.com/en/dev/internals/security/#security-issue-severity-levels",
              "value": "low"
            },
            "type": "Django severity rating"
          }
        },
        {
          "cvssV3_1": {
            "baseScore": 3.1,
            "baseSeverity": "LOW",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N",
            "version": "3.1"
          }
        },
        {
          "cvssV4_0": {
            "baseScore": 2.3,
            "baseSeverity": "LOW",
            "vectorString": "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",
            "version": "4.0"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-178",
              "description": "CWE-178: Improper Handling of Case Sensitivity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-03T13:16:29.593Z",
        "orgId": "6a34fbeb-21d4-45e7-8e0a-62b95bc12c92",
        "shortName": "DSF"
      },
      "references": [
        {
          "name": "Django security archive",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://docs.djangoproject.com/en/dev/releases/security/"
        },
        {
          "name": "Django releases announcements",
          "tags": [
            "mailing-list"
          ],
          "url": "https://groups.google.com/g/django-announce"
        },
        {
          "name": "Django security releases issued: 6.0.6 and 5.2.15",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.djangoproject.com/weblog/2026/jun/03/security-releases/"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "timeline": [
        {
          "lang": "en",
          "time": "2026-05-06T00:00:00.000Z",
          "value": "Initial report received."
        },
        {
          "lang": "en",
          "time": "2026-05-12T00:00:00.000Z",
          "value": "Vulnerability confirmed."
        },
        {
          "lang": "en",
          "time": "2026-06-03T08:00:00.000Z",
          "value": "Security release issued."
        }
      ],
      "title": "Potential exposure of private data via case-sensitive Cache-Control directives in UpdateCacheMiddleware",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "6a34fbeb-21d4-45e7-8e0a-62b95bc12c92",
    "assignerShortName": "DSF",
    "cveId": "CVE-2026-8404",
    "datePublished": "2026-06-03T13:16:29.593Z",
    "dateReserved": "2026-05-12T15:06:18.803Z",
    "dateUpdated": "2026-06-03T15:46:40.439Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

UBUNTU-CVE-2026-8404 (CVE-2026-8404)

CVE-2026-8404 (GCVE-0-2026-8404)

Tags

Sightings

Nomenclature

Related by attack behaviour