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Fencer Vulns
medium 5.8

CVE-2025-27556 json

Django Potential Denial of Service (DoS) on Windows

published 2025-04-02 19 mo ago modified 2026-09-08 2 mo ago also BIT-django-2025-27556 , EUVD-2025-9536 , GHSA-wqfg-m96j-85vm , PYSEC-2025-14

cvss
5.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 65%
public exploits
0
none known

Summary

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.

Patch / fix

  • pypi django 5.0.14, 5.1.8
  • bitnami django 5.0.14, 5.1.8
  • djangoproject Django 5.0.14, 5.1.8
  • python-Django5 openSUSE Tumbleweed 5.2.16-1.1
  • python-Django6 openSUSE Tumbleweed 6.0-1.1
  • python-Django openSUSE Tumbleweed 5.1.8-1.1

opensuse advisories openSUSE-SU-2026:11270-1openSUSE-SU-2026:10005-1openSUSE-SU-2025:14986-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-27556 updated cvss 5.8

django: Django DoS Unicode Attack

  • Red Hat Ansible Automation Platform 2 automation-controller, ansible-automation-platform-24/lightspeed-rhel8, ansible-automation-platform-25/lightspeed-rhel8, ansible-automation-platform-26/lightspeed-rhel9, ansible-automation-platform-24/platform-resource-runner-rhel8 Red Hat Discovery 1 discovery/discovery-server-rhel9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
19 mo ago

Exploit prediction

1.08% chance of exploitation in the next 30 days, higher than 65% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
GitHub 3.1 5.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
pypi django
>=5.0, <5.0.14
>=5.1, <5.1.8
5.0.14
5.1.8
bitnami django
>=5.0.0, <5.0.14
>=5.1.0, <5.1.8
5.0.14
5.1.8

Affected products

  • djangoproject Django

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.