CVE-2025-27556: djangoproject django
Vulnerability summary
CVE-2025-27556 is a high (CVSS 7.5) vulnerability in djangoproject django. EPSS estimates a 1.06% chance of exploitation in the next 30 days, higher than 63.9% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 2 · Related 2Timeline
- 02-04-2025PublishedVulnerability first disclosed.
- 02-04-2025Last modifiedVulnerability information updated.
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 metrics
3 scores · 3 sources · 1 version- CVE.orgCNA5.8MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:LDiffers
- OSV · PypiEcosystem advisory · calculated5.8MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:LDiffers
EPSS trend
Probability
1.06%
Chance of exploitation in the next 30 days
Percentile
64%
Versus all other CVEs
30-day change
+0.02 pp
From 1.04% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Djangoproject1 product
- django≥ 5.0, < 5.0.14 | ≥ 5.1, < 5.1.8
Opensuse1 product
- python-Django&distro=openSUSE Tumbleweed< 5.1.8-1.1
PyPI1 product
- django≥ 5.1, < 5.1.8 | ≥ 5.0, < 5.0.14
3 vendors · 3 products
References
16 links
Show all 16 references
- github.com/django/djangoPACKAGE
- lists.opensuse.org/archives/…Advisory