Django: Denial of Service in django.utils.text.wrap (CVE-2025-26699) #shorts

Summary

Welcome to today's cybersecurity podcast, where we dive into the specifics of recently discovered vulnerabilities that could impact your software and systems. In today's episode, we're going to discuss CVE-2025-26699, a recently identified vulnerability affecting the popular Django web framework. This vulnerability opens the door to potential denial-of-service attacks stemming from the django.utils.text.wrap method and the wordwrap template filter when handling very long strings.

Product details

The security concern centers around Django, a high-level Python web framework that encourages rapid development and clean, pragmatic design. Specifically, the versions impacted are Django 4.2 prior to 4.2.20, Django 5.0 before 5.0.13, and Django 5.1 before 5.1.7. Users and administrators working with these versions should take note of this potential security risk.

Vulnerability type summary

The vulnerability is categorized as a CWE-770 issue, which refers to the 'Allocation of Resources Without Limits or Throttling'. This can result in a denial-of-service condition when large resource requests are not properly managed, potentially causing the application to become unavailable.

Details of the vulnerability

CVE-2025-26699 highlights a flaw in Django's django.utils.text.wrap method and the wordwrap template filter when processing extremely long strings. This flaw could be exploited by attackers to initiate a denial-of-service (DoS) attack, causing the application to consume excessive resources and become unresponsive. The affected versions are vulnerable due to improper handling of resource allocation, making it crucial for users to apply available updates immediately.

Conclusion

If you're using any of the impacted versions of Django, it's important to update to the latest secure versions—Django 4.2.20, Django 5.0.13, or Django 5.1.7—as soon as possible. The issue highlights the critical nature of regular updates and security assessments to maintain robust defenses against exploitation. Keep your systems secure, and stay tuned for more updates on cybersecurity developments.

This chain involves the following actors

This following systems are involved

Attack entry point

Remediation actions

Exploitation actions

• https://docs.djangoproject.com/en/dev/releases/security/
• https://groups.google.com/g/django-announce
• https://www.djangoproject.com/weblog/2025/mar/06/security-releases/