CVE-2026-48587
LOWPotential exposure of private data via whitespace padding in Vary header
Title source: cnaDescription
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.
References (3)
Core 3
Core References
Vendor Advisory vendor-advisory
Django security archive
https://docs.djangoproject.com/en/dev/releases/security/
Vendor Advisory vendor-advisory
Django security releases issued: 6.0.6 and 5.2.15
https://www.djangoproject.com/weblog/2026/jun/03/security-releases/
Scores
CVSS v3
3.1
EPSS
0.0028
EPSS Percentile
19.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-1023
Status
published
Products (5)
djangoproject/Django
5.2 - 5.2.15
djangoproject/django
5.2 - 5.2.15
djangoproject/Django
5.2.15
djangoproject/Django
6.0 - 6.0.6
djangoproject/Django
6.0.6
Published
Jun 03, 2026
Tracked Since
Jun 03, 2026