CVE-2026-25673: 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…

PriorityP340high7.5CVSS 3.1

AVNACLPRNUINSUCNINAH

EPSS

0.73%

49.8th percentile

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.

Affected

8 ranges

Vendor	Product	Version range	Fixed in
debian	python-django	—	—
djangoproject	django	>= 4.2 < 4.2.29	4.2.29
djangoproject	django	>= 4.2 < 4.2.29	4.2.29
djangoproject	django	>= 4.2.0 < 4.2.29	4.2.29
djangoproject	django	>= 5.2 < 5.2.12	5.2.12
djangoproject	django	>= 5.2 < 5.2.12	5.2.12
djangoproject	django	>= 6.0 < 6.0.3	6.0.3
djangoproject	django	>= 6.0 < 6.0.3	6.0.3

CVSS provenance

nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

vendor_debian7.5LOW

vendor_redhat7.5HIGH

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.