Potential exposure of private data via whitespace padding in Vary header
CVE-2026-48587
2.3LOW
What is CVE-2026-48587?
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.
Affected Version(s)
Django 6.0 < 6.0.6
Django 5.2 < 5.2.15
Django 6.0.6
References
CVSS V4
Score:
2.3
Severity:
LOW
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
Unknown
Timeline
Vulnerability published
Vulnerability Reserved
Credit
Navid Rezazadeh
Jake Howard
Natalia Bidart