{"cve":"CVE-2023-46695","nvd":{"published":"2023-11-02T06:15:08.000","modified":"2026-06-17T06:31:22.760","status":"Modified","description":"An issue was discovered in Django 3.2 before 3.2.23, 4.1 before 4.1.13, and 4.2 before 4.2.7. The NFKC normalization is slow on Windows. As a consequence, django.contrib.auth.forms.UsernameField is subject to a potential DoS (denial of service) attack via certain inputs with a very large number of Unicode characters.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-770"],"references":["https://docs.djangoproject.com/en/4.2/releases/security/","https://groups.google.com/forum/#%21forum/django-announce","https://security.netapp.com/advisory/ntap-20231214-0001/","https://www.djangoproject.com/weblog/2023/nov/01/security-releases/","https://docs.djangoproject.com/en/4.2/releases/security/"],"products":["djangoproject:django"],"source":"nvd","synced_at":"2026-10-19T21:40:11.519948003+00:00"},"epss":{"cve":"CVE-2023-46695","score":0.49774,"percentile":0.98897,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-qmf9-6jqf-j8fq","url":"https://osv.dev/vulnerability/GHSA-qmf9-6jqf-j8fq","summary":"Django potential denial of service vulnerability in UsernameField on Windows","modified":"2024-09-20T16:07:45.381236Z","packages":[{"ecosystem":"PyPI","name":"django","purl":"pkg:pypi/django","ranges":[">=3.2a1 <3.2.23"],"fixed":["3.2.23"]},{"ecosystem":"PyPI","name":"django","purl":"pkg:pypi/django","ranges":[">=4.1a1 <4.1.13"],"fixed":["4.1.13"]},{"ecosystem":"PyPI","name":"django","purl":"pkg:pypi/django","ranges":[">=4.2a1 <4.2.7"],"fixed":["4.2.7"]}]},{"id":"PYSEC-2023-222","url":"https://osv.dev/vulnerability/PYSEC-2023-222","summary":"","modified":"2026-06-10T17:01:02.672946253Z","packages":[{"ecosystem":"PyPI","name":"django","purl":"pkg:pypi/django","ranges":[">=3.2 <3.2.23",">=4.1 <4.1.13",">=4.2 <4.2.7"],"fixed":["3.2.23","4.1.13","4.2.7"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}