Vulnerability Details 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 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 27.6%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-25673
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cpe:2.3:a:djangoproject:django:4.2.0
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cpe:2.3:a:djangoproject:django:4.2.1
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cpe:2.3:a:djangoproject:django:4.2.10
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cpe:2.3:a:djangoproject:django:4.2.11
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cpe:2.3:a:djangoproject:django:4.2.12
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cpe:2.3:a:djangoproject:django:4.2.13
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cpe:2.3:a:djangoproject:django:4.2.14
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cpe:2.3:a:djangoproject:django:4.2.15
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cpe:2.3:a:djangoproject:django:4.2.16
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cpe:2.3:a:djangoproject:django:4.2.17
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cpe:2.3:a:djangoproject:django:4.2.18
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cpe:2.3:a:djangoproject:django:4.2.19
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cpe:2.3:a:djangoproject:django:4.2.2
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cpe:2.3:a:djangoproject:django:4.2.20
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cpe:2.3:a:djangoproject:django:4.2.21
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cpe:2.3:a:djangoproject:django:4.2.22
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cpe:2.3:a:djangoproject:django:4.2.23
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cpe:2.3:a:djangoproject:django:4.2.24
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cpe:2.3:a:djangoproject:django:4.2.25
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cpe:2.3:a:djangoproject:django:4.2.26
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cpe:2.3:a:djangoproject:django:4.2.28
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cpe:2.3:a:djangoproject:django:4.2.3
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cpe:2.3:a:djangoproject:django:4.2.4
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cpe:2.3:a:djangoproject:django:4.2.5
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cpe:2.3:a:djangoproject:django:4.2.6
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cpe:2.3:a:djangoproject:django:4.2.7
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cpe:2.3:a:djangoproject:django:4.2.8
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cpe:2.3:a:djangoproject:django:4.2.9
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cpe:2.3:a:djangoproject:django:5.2
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cpe:2.3:a:djangoproject:django:5.2.1
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cpe:2.3:a:djangoproject:django:5.2.10
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cpe:2.3:a:djangoproject:django:5.2.11
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cpe:2.3:a:djangoproject:django:5.2.2
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cpe:2.3:a:djangoproject:django:5.2.3
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cpe:2.3:a:djangoproject:django:5.2.4
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cpe:2.3:a:djangoproject:django:5.2.5
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cpe:2.3:a:djangoproject:django:5.2.6
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cpe:2.3:a:djangoproject:django:5.2.7
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cpe:2.3:a:djangoproject:django:5.2.8
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cpe:2.3:a:djangoproject:django:6.0
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cpe:2.3:a:djangoproject:django:6.0.1
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cpe:2.3:a:djangoproject:django:6.0.2