Vulnerability in Djangoproject Django
CVE-2025-64458
An issue was discovered in 5.1 before 5.1.14, 4.2 before 4.2.26, and 5.2 before 5.2.8. NFKC normalization in Python is slow on Windows. As a consequence, `django.http.HttpResponseRedirect`, `django.http.HttpResponsePermanentRedirect`, and the shortcut `django.shortcuts.redirect` were subject to a potential denial-of-service attack via certain inputs with a very large number of Unicode characters. 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 Seokchan Yoon for reporting this issue.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.019 (78.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 78.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000
Affected products
- Djangoproject Django — versions 5.2, 5.2.8, 5.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 (vendor-advisory, Vendor Advisory)
- 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 (mailing-list, Mailing List)
- 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-64458?
- CVE-2025-64458 is a high-severity vulnerability in Djangoproject Django, classified under Inefficient Algorithmic Complexity. CVSS score: 7.5/10. Published 2025-11-05.
- How severe is CVE-2025-64458?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2025-64458 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.