BIT-DJANGO-2026-48587 Potential exposure of private data via whitespace padding in Vary header

An issue was discovered in Django 5.2 before 5.2.15 and 6.0 before 6.0.6. django.utils.cache.hasvaryheader 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...

CVE-2026-48587

CVE-2026-48587 affects Django 5.2 before 5.2.15 and 6.0 before 6.0.6. The flaw in django.utils.cache.has_vary_header() does not strip leading/trailing whitespace from the Vary header before comparison, enabling remote attackers to read cached responses by requesting URLs whose responses contain w...