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CVE

CVE-2026-25673

Django vulnerable to Uncontrolled Resource Consumption
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CVE

CVE-2026-25673

Django vulnerable to Uncontrolled Resource Consumption

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.5
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
C
H
U
7.5
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Related Resources

No items found.

References

https://nvd.nist.gov/vuln/detail/CVE-2026-25673, https://docs.djangoproject.com/en/dev/releases/security, https://github.com/django/django, https://groups.google.com/g/django-announce, https://www.djangoproject.com/weblog/2026/mar/03/security-releases

Severity

7.5

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
7.5
EPSS Probability
0.0024%
EPSS Percentile
0.47054%
Introduced Version
6.0,1.4,5.0a1,6.0a1,1.2,1.1.3,0
Fix Available
6.0.3,4.2.29,5.2.12,2026.2.1-r0,24.6.1-r30,1.22.0-r7

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