Medium severity5.8NVD Advisory· Published Apr 2, 2025· Updated Jun 17, 2026
CVE-2025-27556
CVE-2025-27556
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
DjangoPyPI | >= 5.0, < 5.0.14 | 5.0.14 |
DjangoPyPI | >= 5.1, < 5.1.8 | 5.1.8 |
Affected products
7cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:*range: >=5.0,<5.0.14
- (no CPE)range: 5.0
- osv-coords5 versionspkg:bitnami/djangopkg:pypi/djangopkg:rpm/opensuse/python-Django&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/python-Django5&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/python-Django6&distro=openSUSE%20Tumbleweed
>= 5.0.0, < 5.0.14+ 4 more
- (no CPE)range: >= 5.0.0, < 5.0.14
- (no CPE)range: >= 5.0, < 5.0.14
- (no CPE)range: < 5.1.8-1.1
- (no CPE)range: < 5.2.16-1.1
- (no CPE)range: < 6.0-1.1
Patches
Vulnerability mechanics
References
13- www.openwall.com/lists/oss-security/2025/04/02/2nvdMailing ListThird Party AdvisoryWEB
- docs.djangoproject.com/en/dev/releases/security/nvdVendor Advisory
- github.com/advisories/GHSA-wqfg-m96j-85vmghsaADVISORY
- groups.google.com/g/django-announcenvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2025-27556ghsaADVISORY
- www.djangoproject.com/weblog/2025/apr/02/security-releases/nvdVendor Advisory
- docs.djangoproject.com/en/dev/releases/securityghsaWEB
- github.com/django/django/commit/2cb311f7b069723027fb5def4044d1816d7d2afdghsaWEB
- github.com/django/django/commit/39e2297210d9d2938c75fc911d45f0e863dc4821ghsaWEB
- github.com/django/django/commit/8c6871b097b6c49d2a782c0d80d908bcbe2116f1ghsaWEB
- github.com/django/django/commit/edc2716d01a6fdd84b173c02031695231bcee1f8ghsaWEB
- github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2025-14.yamlghsaWEB
- www.djangoproject.com/weblog/2025/apr/02/security-releasesghsaWEB
News mentions
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