CVE-2026-8404

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.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8404.json",
    "cna_assigner": "DSF",
    "cwe_ids": [
        "CWE-178"
    ]
}

References

Affected packages

Git / github.com/django/django

Affected ranges

Type

GIT

Repo

https://github.com/django/django

Events

Introduced

9e7cc2b628fe8fd3895986af9b7fc9525034c1b0

Fixed

21e98408f84d22191e2c7ee4052bdd12d264fd3f

Introduced

36b5f39d9372147f0e758f590e35ee2b2bc317dd

Fixed

ee93f65169c280c9ab3d2ce103dd478c96d05065

Database specific

{
    "source": "CPE_RANGE",
    "cpe": "cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "5.2"
        },
        {
            "fixed": "5.2.15"
        },
        {
            "introduced": "6.0"
        },
        {
            "fixed": "6.0.6"
        }
    ]
}

Affected versions

5.*

5.2

5.2.1

5.2.10

5.2.11

5.2.12

5.2.13

5.2.14

5.2.2

5.2.3

5.2.4

5.2.5

5.2.6

5.2.7

5.2.8

5.2.9

6.*

6.0

6.0.1

6.0.2

6.0.3

6.0.4

6.0.5

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-8404.json"