How severe is CVE-2026-25673?

CVE-2026-25673 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-25673 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-25673?

CVE-2026-25673 affects Djangoproject Django. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-25673?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-25673 have an EU (EUVD) identifier?

Yes. CVE-2026-25673 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9294.

When was CVE-2026-25673 published?

CVE-2026-25673 was published on 2026-03-03 and last updated on 2026-06-30.

CVE-2026-25673

CVE-2026-25673 is a high-severity vulnerability in Djangoproject Django with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-770.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9294
Weakness: CWE-770
Affected product: Djangoproject Django
Published: 2026-03-03
Last modified: 2026-06-30

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-25673?: CVE-2026-25673 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-25673 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-25673?: CVE-2026-25673 affects Djangoproject Django. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-25673?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-25673 have an EU (EUVD) identifier?: Yes. CVE-2026-25673 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9294.
When was CVE-2026-25673 published?: CVE-2026-25673 was published on 2026-03-03 and last updated on 2026-06-30.

References

Affected products (1)

cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:*

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