CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2026-25673
High (7.5) in djangoproject django. EPSS 0.8% chance of exploitation in the next 30 days. Fixed in django 4.2.29, 5.2.12, 6.0.3.
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.
Severity
- EPSS
- 0.8% chance of exploitation in the next 30 days; higher than 57% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-770, CWE-400
- Published
- Modified
- Record from
- the NVD, synced
Affected
- djangoproject:django
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-8p8v-wh79-9r56 | PyPI | django | >=6.0 <6.0.3 | 6.0.3 |
| GHSA-8p8v-wh79-9r56 | PyPI | django | >=5.2 <5.2.12 | 5.2.12 |
| GHSA-8p8v-wh79-9r56 | PyPI | django | >=4.2 <4.2.29 | 4.2.29 |
| PYSEC-2026-2448 | PyPI | django | >=4.2 <4.2.29 >=5.2 <5.2.12 >=6.0 <6.0.3 | 4.2.29, 5.2.12, 6.0.3 |