CVE-2026-48587
Low
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.
SeverityLow
CVSS3.1
Exploit probability—
Product
Django
PublishedJun 3, 2026
First seenJun 3, 2026
Weakness typeCWE-1023CWE-1023
How to fix
Update
- djangoproject django5.2.15, 6.0.6 or later
- django5.2.15, 6.0.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| djangoproject django | 5.2 ≤ v < 5.2.15, 6.0 ≤ v < 6.0.6 | 5.2.15, 6.0.6 |
| djangoPyPI | v < 5.2.15, 6.0.0 ≤ v < 6.0.6, 5.2 ≤ v < 5.2.15, 6.0 ≤ v < 6.0.6 | 5.2.15, 6.0.6 |
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