CVE-2026-113593
Potential exposure of private data via empty and missing Vary headers
An issue was discovered in Django 6.1 before 6.1.3, 6.0 before 6.0.10, and 5.2 before 5.2.19. The `django.middleware.cache.UpdateCacheMiddleware` and the `django.views.decorators.cache.cache_page()` decorator generate identical cache keys for requests that omit a header listed in the response’s `Vary` header and requests that include that header with an empty value, potentially allowing remote attackers to access private data cached for another request. Earlier, unsupported Django series (such as 5.1.x, 5.0.x, and 4.2.x) were not evaluated and may also be affected. Django would like to thank Andrew Gonzalez for reporting this issue.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: DSFFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: DSFFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: DSFFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: DSFAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| Django djangoproject django
https://pypi.org/project/Django/ |
≥ 6.1; < 6.1.3 (affected, python) 6.1.3 (unaffected, python) ≥ 6.0; < 6.0.10 (affected, python) 6.0.10 (unaffected, python) ≥ 5.2; < 5.2.19 (affected, python) 5.2.19 (unaffected, python) Other versions: unaffected |
CNA: DSF |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 3.1 low |
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N | CNA: DSF |
| 4.0 / 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 | CNA: DSF |
| 4.0 / 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | NVD: 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 |
| 3.1 / 3.1 low |
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N | NVD: 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://docs.djangoproject.com/en/dev/releases/security/CNA: DSF · vendor-advisory
- https://groups.google.com/g/django-announceCNA: DSF · mailing-list
- https://github.com/django/django/commit/c0b7e5e4e4546e8ddc58262f1945938bb9d9ac2dCNA: DSF · patch
- https://github.com/django/django/commit/55e2e009b4f3996e5c55af7b22a8c41eb826e892CNA: DSF · patch
- https://github.com/django/django/commit/2006a2b068766bf332f1afcc32b7614d8e5759a2CNA: DSF · patch
- https://github.com/django/django/commit/9007fecd3633cfd90b093ebe106af564347c8aeeCNA: DSF · patch
- https://www.djangoproject.com/weblog/2026/nov/03/security-releases/CNA: DSF · vendor-advisory
- https://docs.djangoproject.com/en/dev/releases/security/6a34fbeb-21d4-45e7-8e0a-62b95bc12c92
- https://github.com/django/django/commit/2006a2b068766bf332f1afcc32b7614d8e5759a26a34fbeb-21d4-45e7-8e0a-62b95bc12c92
- https://github.com/django/django/commit/55e2e009b4f3996e5c55af7b22a8c41eb826e8926a34fbeb-21d4-45e7-8e0a-62b95bc12c92
- https://github.com/django/django/commit/9007fecd3633cfd90b093ebe106af564347c8aee6a34fbeb-21d4-45e7-8e0a-62b95bc12c92
- https://github.com/django/django/commit/c0b7e5e4e4546e8ddc58262f1945938bb9d9ac2d6a34fbeb-21d4-45e7-8e0a-62b95bc12c92
- https://groups.google.com/g/django-announce6a34fbeb-21d4-45e7-8e0a-62b95bc12c92
- https://www.djangoproject.com/weblog/2026/nov/03/security-releases/6a34fbeb-21d4-45e7-8e0a-62b95bc12c92
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