CVE-2026-48587
LowCVSS 3.1Exploitation Probability (EPSS)
Low risk28th percentile - higher than 28% of all known CVEs
Summary
In Django 5.2 before 5.2.15 and 6.0 before 6.0.6, `django.utils.cache.has_vary_header()` does not strip leading or trailing whitespace from `Vary` response header values before comparison. This allows remote attackers to read cached responses via requests to URLs whose responses contain whitespace-padded Vary header values.
Risk Assessment
Sensitive data cached in responses may be disclosed to unauthenticated users by manipulating the Vary header.
Recommendation
Upgrade Django to version 5.2.15, 6.0.6, or later.
Original NVD description (English source)
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.