Django Inefficient Algorithmic Complexity Vulnerability - 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.