CVE catalog

CVE-2026-25673

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Mar 3, 2026, 2:28:28 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.76% · Oct 25, 2026

An issue was discovered in 6.0 before 6.0.3, 5.2 before 5.2.12, and 4.2 before 4.2.29. `URLField.to_python()` in Django calls `urllib.parse.urlsplit()`, which performs NFKC normalization on Windows that is disproportionately slow for certain Unicode characters, allowing a remote attacker to cause denial of service via large URL inputs containing these characters. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to thank Seokchan Yoon for reporting this issue.

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	`3:5.2.18-1`	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
PyPI	Django	Not reported	`6.0.3`	fixed
PyPI	Django	Not reported	`5.2.12`	fixed
PyPI	Django	Not reported	`4.2.29`	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
PyPI	Django	PyPI	Not reported	`6.0.3`	Not reported	Not reported	Not reported
PyPI	Django	PyPI	Not reported	`5.2.12`	Not reported	Not reported	Not reported
PyPI	Django	PyPI	Not reported	`4.2.29`	Not reported	Not reported	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

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

Observed: Oct 27, 2026, 9:30:57 AM UTC

References

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