{"cve":"CVE-2025-27556","nvd":{"published":"2025-04-02T13:15:44.373","modified":"2026-06-17T09:03:47.890","status":"Analyzed","description":"An issue was discovered in Django 5.1 before 5.1.8 and 5.0 before 5.0.14. The NFKC normalization is slow on Windows. As a consequence, django.contrib.auth.views.LoginView, django.contrib.auth.views.LogoutView, and django.views.i18n.set_language are subject to a potential 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/dev/releases/security/","https://groups.google.com/g/django-announce","https://www.djangoproject.com/weblog/2025/apr/02/security-releases/","http://www.openwall.com/lists/oss-security/2025/04/02/2"],"products":["djangoproject:django"],"source":"nvd","synced_at":"2026-10-19T22:00:57.946988208+00:00"},"epss":{"cve":"CVE-2025-27556","score":0.01079,"percentile":0.65079,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-wqfg-m96j-85vm","url":"https://osv.dev/vulnerability/GHSA-wqfg-m96j-85vm","summary":"Django Potential Denial of Service (DoS) on Windows ","modified":"2025-09-25T09:27:20.004567Z","packages":[{"ecosystem":"PyPI","name":"django","purl":"pkg:pypi/django","ranges":[">=5.0 <5.0.14"],"fixed":["5.0.14"]},{"ecosystem":"PyPI","name":"django","purl":"pkg:pypi/django","ranges":[">=5.1 <5.1.8"],"fixed":["5.1.8"]}]},{"id":"PYSEC-2025-14","url":"https://osv.dev/vulnerability/PYSEC-2025-14","summary":"","modified":"2026-06-10T17:01:07.408374749Z","packages":[{"ecosystem":"PyPI","name":"django","purl":"pkg:pypi/django","ranges":[">=5.1 <5.1.8",">=5.0 <5.0.14"],"fixed":["5.1.8","5.0.14"]}]}],"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."]}