TI-2026-20761 Aliases CVE-2026-25673 GHSA-8p8v-wh79-9r56

Potential denial-of-service vulnerability in URLField via Unicode normalization on Windows

MEDIUM 40CWE-400Published 2026-03-03 · Updated 2026-07-15

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and GitHub. Impact type from CWE-400.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00842 58th percentileScored 2026-11-07

Fix Fixed Django (djangoproject): 6.0.3, 5.2.12, 4.2.29Django (PyPI): 6.0.3, 5.2.12, 4.2.29

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
djangoproject	Django	6.0 to before 6.0.3; 5.2 to before 5.2.12; 4.2 to before 4.2.29	6.0.3, 5.2.12, 4.2.29	Patch available	CNA
—	Django (PyPI)	6.0 to before 6.0.3	6.0.3	Patch available	GHSA-8p8v-wh79-9r56
—	Django (PyPI)	5.2 to before 5.2.12	5.2.12	Patch available	GHSA-8p8v-wh79-9r56
—	Django (PyPI)	4.2 to before 4.2.29	4.2.29	Patch available	GHSA-8p8v-wh79-9r56

Django Vendordjangoproject Affected 6.0 to before 6.0.3; 5.2 to before 5.2.12; 4.2 to before 4.2.29 Fixed in 6.0.3, 5.2.12, 4.2.29 Patch available CNA
Django (PyPI) Vendor— Affected 6.0 to before 6.0.3 Fixed in 6.0.3 Patch available GHSA-8p8v-wh79-9r56
Django (PyPI) Vendor— Affected 5.2 to before 5.2.12 Fixed in 5.2.12 Patch available GHSA-8p8v-wh79-9r56
Django (PyPI) Vendor— Affected 4.2 to before 4.2.29 Fixed in 4.2.29 Patch available GHSA-8p8v-wh79-9r56

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:djangoproject:django::::::::	4.2.0 to before 4.2.29; 5.2 to before 5.2.12; 6.0 to before 6.0.3	Vulnerable	djangoproject

cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:* Versions 4.2.0 to before 4.2.29; 5.2 to before 5.2.12; 6.0 to before 6.0.3 Vulnerable ·djangoproject

Remediation

Fix · CNA Django (djangoproject) Fixed in 6.0.3, 5.2.12, 4.2.29
Fix · GHSA-8p8v-wh79-9r56 Django (PyPI) Fixed in 6.0.3 Advisory →
Fix · GHSA-8p8v-wh79-9r56 Django (PyPI) Fixed in 5.2.12 Advisory →
Fix · GHSA-8p8v-wh79-9r56 Django (PyPI) Fixed in 4.2.29 Advisory →

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Advisory · 2026-03-03
djangoproject Django — Django security releases issued: 6.0.3, 5.2.12, and 4.2.29
2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2026-20762 Potential incorrect permissions on newly created file system objectsPriority LOW 18
Show all 2 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Not affected: 3 products

Red Hat Ansible Automation Platform 2
Red Hat Discovery 2
Red Hat Satellite 6

Timeline

2026-10-02 Threatist record created from CVE-2026-25673
2026-10-03 Alias added: GHSA-8p8v-wh79-9r56

References

Patch 2

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-25673

Other 4

TI-2022-15177 An issue was discovered in Django 3.2 before 3.2.14 and 4.0 before 4.0.6. CVSS 3.1CRITICAL 9.8
TI-2020-05994 Django 1.11 before 1.11.28, 2.2 before 2.2.10, and 3.0 before 3.0.3 allows SQL Injection… CVSS 3.1CRITICAL 9.8
TI-2023-10198 An issue was discovered in the Multipart Request Parser in Django 3.2 before 3.2.18, 4.0… CVSS 3.1HIGH 7.5
TI-2019-14306 Django before 1.11.27, 2.x before 2.2.9, and 3.x before 3.0.1 allows account takeover. CVSS 3.1CRITICAL 9.8
TI-2019-10595 An issue was discovered in Django 1.11.x before 1.11.23, 2.1.x before 2.1.11, and 2.2.x… CVSS 3.0CRITICAL 9.8
TI-2021-14006 Django 3.1.x before 3.1.13 and 3.2.x before 3.2.5 allows QuerySet.order_by SQL injection… CVSS 3.1CRITICAL 9.8

See all 156 →

Sources

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