Medium severity · published Jun 3, 2026
CVE-2026-48587
Potential exposure of private data via whitespace padding in Vary header
5.3
CVSS
0.4%
EPSS
No
On KEV
Description
An issue was discovered in Django 5.2 before 5.2.15 and 6.0 before 6.0.6.
`django.utils.cache.has_vary_header()` in Django does not strip leading or trailing whitespace from `Vary` response header values before comparison, which allows remote attackers to read cached responses via requests to URLs whose responses contain whitespace-padded Vary header 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 Navid Rezazadeh for reporting this issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DJ
Django · djangoproject
6.0 before 6.0.6; 5.2 before 5.2.15 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-48587
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-48587
Patch
https://docs.djangoproject.com/en/dev/releases/security/
Release Notes
https://groups.google.com/g/django-announce
Patch
https://www.djangoproject.com/weblog/2026/jun/03/security-releases/
More from Django
9.8
CVE-2026-4277
Privilege abuse in GenericInlineModelAdmin
9.8
CVE-2025-59681
An issue was discovered in Django 4.2 before 4.2.25, 5.1 before 5.1.13, and 5.2 before 5.2.7
9.8
CVE-2024-53908
An issue was discovered in Django 5.1 before 5.1.4, 5.0 before 5.0.10, and 4.2 before 4.2.17
9.8
CVE-2023-31047
In Django 3.2 before 3.2.19, 4.x before 4.1.9, and 4.2 before 4.2.1, it was possible to bypass validation when using one form field to upload multiple files
9.8
CVE-2022-34265
An issue was discovered in Django 3.2 before 3.2.14 and 4.0 before 4.0.6