CVE catalog

CVE-2025-27556

python-django: CVE-2025-27556

Severity: Medium · CVSS 5.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Published: Apr 2, 2025, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 1.08% · Oct 27, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	python-django	sid	`3:5.2.18-2`	not affected
Debian	python-django	forky	`3:5.2.17-2`	not affected
Debian	python-django	trixie	`3:4.2.28-0+deb13u2`	not affected
Debian	python-django	trixie-security	`3:4.2.28-0+deb13u1`	not affected
Debian	python-django	bookworm	`3:3.2.25-0+deb12u3`	not affected
Debian	python-django	bookworm-security	`3:3.2.25-0+deb12u6`	not affected
Opensuse	python-Django	tumbleweed	`5.1.8-1.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	python-django	source	sid	`Not affected`	unimportant	Not reported	Not reported
Debian	python-django	source	forky	`Not affected`	unimportant	Not reported	Not reported
Debian	python-django	source	trixie	`Not affected`	unimportant	Not reported	Not reported
Debian	python-django	source	bookworm	`Not affected`	unimportant	Not reported	Not reported
Opensuse	python-Django	rpm	tumbleweed	`5.1.8-1.1`	Not reported	OPENSUSE-SU-2025:14986-1	Not reported

OpenFactory catalog packages

[openSUSE Tumbleweed]

[python313-Django]Unknown
Source package: [python-Django]
Details (1)
- 6.0.8-1.1 · noarch · tumbleweed
  Unknown · Fixed: 5.1.8-1.1
  Version impact unknown
  dsa · python-Django · opensuse · tumbleweed
[python314-Django]Unknown
Source package: [python-Django]
Details (1)
- 6.0.8-1.1 · noarch · tumbleweed
  Unknown · Fixed: 5.1.8-1.1
  Version impact unknown
  dsa · python-Django · opensuse · tumbleweed

[Debian 12 (Bookworm)]

[python3-django]Not affected
Source package: [python-django]
Details (6)
- 3:3.2.25-0+deb12u3 · all · bookworm
  Not affected
  dsa · python-django · debian · bookworm
- 3:3.2.25-0+deb12u3 · all · bookworm
  Not affected
  dsa · python-django · debian · bookworm
- 3:4.2.21-1~bpo12+1 · all · bookworm-backports
  Not affected
  dsa · python-django · debian · bookworm
- 3:4.2.21-1~bpo12+1 · all · bookworm-backports
  Not affected
  dsa · python-django · debian · bookworm
- 3:3.2.25-0+deb12u4 · all · bookworm-security
  Not affected
  dsa · python-django · debian · bookworm
- 3:3.2.25-0+deb12u4 · all · bookworm-security
  Not affected
  dsa · python-django · debian · bookworm
[python-django-doc]Not affected
Source package: [python-django]
Details (6)
- 3:3.2.25-0+deb12u3 · all · bookworm
  Not affected
  dsa · python-django · debian · bookworm
- 3:3.2.25-0+deb12u3 · all · bookworm
  Not affected
  dsa · python-django · debian · bookworm
- 3:4.2.21-1~bpo12+1 · all · bookworm-backports
  Not affected
  dsa · python-django · debian · bookworm
- 3:4.2.21-1~bpo12+1 · all · bookworm-backports
  Not affected
  dsa · python-django · debian · bookworm
- 3:3.2.25-0+deb12u4 · all · bookworm-security
  Not affected
  dsa · python-django · debian · bookworm
- 3:3.2.25-0+deb12u4 · all · bookworm-security
  Not affected
  dsa · python-django · debian · bookworm

Observed: Oct 27, 2026, 2:57:30 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]