Vulnerability in Djangoproject Django
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (35.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.001
Affected products
- Djangoproject Django — versions 6.0, 6.0.6, 5.2
Weakness classification (CWE)
References
- 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 (vendor-advisory, Patch, Vendor Advisory)
- 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 (mailing-list, Release Notes)
- 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 (vendor-advisory, Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-48587?
- CVE-2026-48587 is a low-severity vulnerability in Djangoproject Django, classified under CWE-1023. CVSS score: 3.1/10. Published 2026-06-03.
- How severe is CVE-2026-48587?
- Low severity. CVSS v3 base score is 3.1 out of 10.