Potential exposure of private data via empty and missing Vary headers

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-113593
StatePUBLISHED
AssignerDSF
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-03 16:17:19 UTC
Updated2026-11-03 19:17:53 UTC
DescriptionAn 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.

Risk And Classification

Primary CVSS: v4.0 2.3 LOW from 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92

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

Problem Types: CWE-524 | CWE-524 CWE-524: Use of Cache Containing Sensitive Information

VersionSourceTypeScoreSeverityVector
4.06a34fbeb-21d4-45e7-8e0a-62b95bc12c92Secondary2.3LOWCVSS: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/C...
4.0CNADECLARED2.3LOWCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
3.16a34fbeb-21d4-45e7-8e0a-62b95bc12c92Secondary3.1LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
3.1CNADECLARED3.1LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
Passive
Confidentiality
Low
Integrity
None
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Djangoproject Django affected 6.1 6.1.3 python Not specified
CNA Djangoproject Django unaffected 6.1.3 python Not specified
CNA Djangoproject Django affected 6.0 6.0.10 python Not specified
CNA Djangoproject Django unaffected 6.0.10 python Not specified
CNA Djangoproject Django affected 5.2 5.2.19 python Not specified
CNA Djangoproject Django unaffected 5.2.19 python Not specified

References

ReferenceSourceLinkTags
github.com/django/django/commit/2006a2b068766bf332f1afcc32b7614d8e5759a2 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 github.com
groups.google.com/g/django-announce 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 groups.google.com
docs.djangoproject.com/en/dev/releases/security 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 docs.djangoproject.com
www.djangoproject.com/weblog/2026/nov/03/security-releases 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 www.djangoproject.com
github.com/django/django/commit/c0b7e5e4e4546e8ddc58262f1945938bb9d9ac2d 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 github.com
github.com/django/django/commit/55e2e009b4f3996e5c55af7b22a8c41eb826e892 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 github.com
github.com/django/django/commit/9007fecd3633cfd90b093ebe106af564347c8aee 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Andrew Gonzalez (en)

CNA: Andrew Gonzalez (en)

CNA: Jake Howard (en)

CNA: Sarah Boyce (en)

CNA: Jacob Walls (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-09-26T12:00:00.000ZInitial report received.
CNA2026-10-08T12:00:00.000ZVulnerability confirmed.
CNA2026-11-03T09:30:00.000ZSecurity release issued.

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