How severe is CVE-2025-27556?

CVE-2025-27556 has a CVSS 3.x base score of 5.8, rated medium 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 low.

Is CVE-2025-27556 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-27556?

CVE-2025-27556 affects Djangoproject Django. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-27556?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-27556 have an EU (EUVD) identifier?

Yes. CVE-2025-27556 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-9536.

When was CVE-2025-27556 published?

CVE-2025-27556 was published on 2025-04-02 and last updated on 2026-06-17.

CVE-2025-27556

CVE-2025-27556 is a medium-severity vulnerability in Djangoproject Django with a CVSS 3.x base score of 5.8. 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: Medium (CVSS 3.x base score 5.8)
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-9536
Weakness: CWE-770
Affected product: Djangoproject Django
Published: 2025-04-02
Last modified: 2026-06-17

Description

An issue was discovered in Django 5.1 before 5.1.8 and 5.0 before 5.0.14. The NFKC normalization is slow on Windows. As a consequence, django.contrib.auth.views.LoginView, django.contrib.auth.views.LogoutView, and django.views.i18n.set_language are subject to a potential denial-of-service attack via certain inputs with a very large number of Unicode characters.

Frequently asked questions

What is CVE-2025-27556?: An issue was discovered in Django 5.1 before 5.1.8 and 5.0 before 5.0.14. The NFKC normalization is slow on Windows. As a consequence, django.contrib.auth.views.LoginView, django.contrib.auth.views.LogoutView, and django.views.i18n.set_language are subject to a potential denial-of-service attack via certain inputs with a very large number of Unicode characters.
How severe is CVE-2025-27556?: CVE-2025-27556 has a CVSS 3.x base score of 5.8, rated medium 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 low.
Is CVE-2025-27556 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-27556?: CVE-2025-27556 affects Djangoproject Django. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-27556?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-27556 have an EU (EUVD) identifier?: Yes. CVE-2025-27556 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-9536.
When was CVE-2025-27556 published?: CVE-2025-27556 was published on 2025-04-02 and last updated on 2026-06-17.

References

Affected products (1)

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

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